It’s answer will be 91. Because 91 can be divisible by 7,13,91,1. It is quite clear that prime number should be divisible only by itself and by 1.

Which one of the following is not a prime number a 31b 61c 71d 91?

91 is not a prime number. The number which has only two factors 1 and itself. So, 91 has more than two factors. Hence, 91 is not a prime number.

Which of the following is not prime number A 241 B 337 C 391 D 571?

In the following options , the correct option is ( C ) 391….. because the number 391 can be divided by 17 and 23…..

Which one of the following number is prime?

Explanation: The primes, in order, are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, … etc.

Is 31 a prime number Yes or no?

Yes, 31 is a prime number. The number 31 is divisible only by 1 and the number itself. … Since 31 has exactly two factors, i.e. 1 and 31, it is a prime number.

Why is 81 not a prime number?

No, 81 is not a prime number. The number 81 is divisible by 1, 3, 9, 27, 81. … Since 81 has more than two factors, i.e. 1, 3, 9, 27, 81, it is not a prime number.

Which one of the following is not a prime number 91?

91 is divisible by 7. So, it is not a prime number.

Which of the following are prime number 23?

23 has only two factors, 1 and 23 therefore, it is a prime number.

Which of the following are prime numbers 137?

The number 137 is prime and therefore its factors are only the numbers 1 and 137 itself. Hence, it has only one prime factor that is the number itself, i.e. 137.

Which of the following are prime numbers I 241 2 337?

337 is a prime number. <br> II.

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Which of following is not a prime number 241?

No, since 241 has only two factors, i.e. 1 and 241. In other words, 241 is not a composite number because 241 doesn’t have more than 2 factors.

Is 17 a prime or composite number?

The first 10 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29. There are 25 prime numbers between 1 and 100. Prime numbers can continue well past 100. For example, 21,577 is a prime number.

Is 79 a prime numbers?

Yes, 79 is a prime number. The number 79 is divisible only by 1 and the number itself. … Since 79 has exactly two factors, i.e. 1 and 79, it is a prime number.

What are the first 30 prime numbers?

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

What are the first 15 prime numbers?

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47…

Which of the following is a prime number 33 81?

Which of the following is a prime number :- 33, 81 , 93 , 97 ? 97 is a prime number as it is divisible by 1 and 97 only.

What are the prime factors of 153?

• All Factors of 153: 1, 3, 9, 17, 51 and 153.
• Negative Factors of 153: -1, -3, -9, -17, -51 and -153.
• Prime Factors of 153: 3, 17.
• Prime Factorization of 153: 32 × 171
• Sum of Factors of 153: 234.

Which of the following is not composite number?

Likewise, the integers 2 and 3 are not composite numbers because each of them can only be divided by one and itself. Every composite number can be written as the product of two or more (not necessarily distinct) primes.

Is 87 prime or not?

No, 87 is not a prime number. The number 87 is divisible by 1, 3, 29, 87. For a number to be classified as a prime number, it should have exactly two factors. Since 87 has more than two factors, i.e. 1, 3, 29, 87, it is not a prime number.

Is 89 a prime number Why?

Yes, 89 is a prime number. The number 89 is divisible only by 1 and the number itself. … Since 89 has exactly two factors, i.e. 1 and 89, it is a prime number.

Is 61 a prime numbers?

61 is: the 18th prime number. a twin prime with 59.

Which of the following are prime number 161?

Since, the prime factors of 161 are 7, 23. Therefore, the product of prime factors = 7 × 23 = 161.

Which of the following are prime number 331?

331 is a prime number from 301-400. 331 has 2 factors, 1 and 331. It is the 67th prime number, and the fifth prime number from 301-400.

Which of the following are prime numbers 103?

The number 103 is prime and therefore its factors are only the numbers 1 and 103 itself. Hence, it has only one prime factor that is the number itself, i.e. 103.

Which of the following numbers are prime of 37?

The Prime Factor of 37 is 1, 37 and its Factors in Pairs are (1, 37). What Are the Factors of 37?

Which of the following numbers are prime 29?

Hence the answer is 29,43,61 are prime numbers. Because they don’t have more than 1 factor. Step-by-step explanation: A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers.

Which of the following numbers are prime a 51?

The number 51 is divisible by 1, 3, 17, 51. For a number to be classified as a prime number, it should have exactly two factors.

What is the average of all prime number between 30 to 50?

Average = sum of prime numbers (between 30 and 50) / total number of prime numbers (between 30 and 50). We know that, Average = sum of prime numbers (between 30 and 50) / total number of prime numbers (between 30 and 50). Hence, the answer is option D.

When 20 of a number is added to another number?

So, 20% of number is added to another, the second number increases to its 108%. Hence, the ratio of first and second number is 2:5.

Is 251 a prime no?

251 (two hundred [and] fifty-one) is the natural number between 250 and 252. It is also a prime number.

Is 177 prime or composite?

Is 177 a Composite Number? Yes, since 177 has more than two factors i.e. 1, 3, 59, 177. In other words, 177 is a composite number because 177 has more than 2 factors.