The numbers 23, 29, 31 and 37 are prime.
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The prime numbers (factors) of 39 are: 3 and 13
The prime numbers between 1 and 39 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, and 37.
39 is the product when the two prime numbers 3 and 13 are multiplied.
The prime factors of 39 are 3 and 13.
3 x 13 = 39