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Why is 19 a prime number but 15 is not a prime number?

Anonymous

∙ 14y ago

Updated: 8/18/2019

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.

Wiki User

∙ 14y ago

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