39
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Of 23 and 39, only 23 is a prime number.
17, 23 and 31 are prime. 39 is not.
17, 23 and 31 are prime. 39 is not.
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.
39 is not a prime number.