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Because when you multiply the numbers 7 and 9 together you get 63, so it has more factors than just itself and 1, making it composite.

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13y ago

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A Prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

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12y ago
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Q: Why 63 is not a prime number?
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