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

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17, 23 and 31 are prime. 39 is not.

17, 23 and 31 are prime. 39 is not.

17, 19, 23, 29, and 31

51 is composite number

17, 19, 23, 29, and 31

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17, 23 and 31 are prime. 39 is not.

17, 23 and 31 are prime. 39 is not.

39

17, 19, 23, 29, and 31

51 is composite number

17, 31 and 23 are.

51 = 3 x 17

17, 19, 23, 29, and 31

No, 12121 is composite. Its prime factors are: 31 x 23 x 17 = 12121

prime numbers above 13 = 17, 19, 23, 29, 31,...

7 11 13 17 19 23 29.

39 is not prime because 13 and 3 are factors of it. To be prime the number cannot have any factors except itself and 1.