Alicia wrote these numbers:2,9,15,21.which of Alicia numbers is not a composite number?

asked Nov 1, 2017 227k views

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2 is a prime number

not composite

Jeremy Z answered Nov 3, 2017

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A number can either be composite or prime. The only prime number that you listed here is 2, because the only factors of 2 are 1 and itself.

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