Because it is divisible by numbers other than 1 and itself.
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39 is not a prime; it is a composite number.
No. 39 = 3 * 13 39=3 so in that case 39 is not a prime number
39 is not a prime number because it has four factors: 1,3,13,39 and because prime number are numbers who has 2 factors.
39
39 is not a prime number. It can be divided by 3 and 13.