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All of the numbers less than 100 (except for -1, 0 and 1) have prime factors. I suspect you left some qualifying information out of your question.

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12y ago

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Is a prime number a factor of 1?

no, factors of a number would be less than that of the original number. A prime number is a number that has factors of only itself and 1.


What number less than 20 an odd number and has 2 different prime factors?

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