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

and 91 by 1,7,13,91

Q: Is 51 and 91 a prime number?

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

91 = 13*751 = 17*321 = 3*731 is prime. â–

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.

3 x 17 = 51. It has factors other than 1 and itself. It is composite. 61 is prime. Its only factors are 1 and 61. 71 is prime. Its only factors are 1 and 71. 7 x 13 = 91. It is a composite number.

91 cannot be in the prime factorization of any number because it is not a prime number itself.

Related questions

31 is 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 × 13

31

31

31

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.

91 = 13*751 = 17*321 = 3*731 is prime. â–

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

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.

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.

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.

51 is not a prime number: 3x17=51