Because it has more than two factors.
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39 is a Composite Number.
39 is composite because its factors are:1x393x13(1, 3, 13, 39)39 is a composite number because it has other factors aside from 1 and itself.The other factors of 39 are 3 and 13.
39 is composite
43 is prime; 39 is composite.
I'm sure it's composite, 3x13=39