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19 only has 2 factors - itself and 1.
15 has 4 factors - itself, 1, 3, and 5.
Prime numbers can only have 2 factors.
19 is prime, 15 is composite.
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∙ 13y agoThis answer is:
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Earn +20 ptsQ: Why is 19 a prime number but 15 is not a prime number?
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