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# Is 51 and 91 a prime number?

Updated: 4/28/2022

Wiki User

13y ago

both are composite numbers 51 is divisible by 1,3,17,51

and 91 by 1,7,13,91

Wiki User

13y ago

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Q: Is 51 and 91 a prime number?
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### Which of 21 31 51 and 91 is a prime number?

31 is a prime number.

### Is 41 51 71 81 91 a prime number?

41 is prime. 51 is composite. 51=3 x 17 . 71 is prime. 81 is composite. 92 91 is composite. 91 = 7 &times; 13

31

31

31

### Why would 51 and 91 be mistaken for prime numbers?

A person unfamiliar with prime numbers could mistake 51, 91, or any other composite number for a prime number if the person did not factor the number to make sure it had no other factors then 1 and itself.

### Which number is a prime number a.91 b.51 c.31 d. 21?

91 = 13*751 = 17*321 = 3*731 is prime. &acirc;&ndash;&nbsp;

### What number is a prime number 91 51 31 21?

31 is the only one that has only two factors: 1 and itself. It is the prime number.

### Which number is prime out of 91 51 31 21?

21 is divisible by 3 and 7, so it is composite. 91 is divisible by 7 and 13, so it is composite. 51 is divisible by 3 and 17. 31 is divisible by only 1 and itself, so it is the prime number.

### Is 51 a prime?

No, 51 is not a prime number. A prime number is a number that has only itself and 1 as a factor. 51's factors are 1,3,17, and 51.

### Which of these numbers are prime number 51 51 61 49?

61 is a prime number. 49 is not a prime number as it is divisible by 7. 51 is not a prime number as it is divisible by 3.

### Which is not a prime number 17 23 31 or 51?

51 is not a prime number: 3x17=51