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.
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17, 23 and 31 are prime. 39 is not.
17, 23 and 31 are prime. 39 is not.
51 is not a prime number: 3x17=51
17, 19, 23, 29, and 31
51 is composite number