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Why are the prime factors of 15 1 3 and 5?

Updated: 8/20/2019
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The prime factors of 15 are 3 and 5 because 3 and 5 are prime numbers that divide evenly into 15. 1 is a factor of 15, but it is not a Prime number.

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Q: Why are the prime factors of 15 1 3 and 5?
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