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15 has more than exactly two factors (1, 3, 5, and 15), therefore it is composite.

17, 19, and 23 each have exactly 2 factors (1 and the number itself), so they are primes.

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23

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HEIDI IBOY SIS

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1y ago
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23

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Anonymous

5y ago
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Q: What number is composite 15 17 19 0r 23?
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