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Yes.

Composite numbers have more than exactly two factors; 39 has four factors: 1, 3, 13, 39.

Prime numbers have exactly two factors, eg 3 has the two factors 1 and 3.

Square numbers have an odd number of factors, eg 36 has nine factors: 1, 2, 3, 4, 6, 9, 12, 18, 36.

The number 1 is not prime as it only has one factor: 1.

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Q: Is 39 a composite
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