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A composite number is a number that has additional factors besides ' 1 ' and itself.

The number ' 1 ' has no additional factors besides ' 1 ' and itself. So it's not a composite number.

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Tyree West

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3y ago

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Wiki User

16y ago

I believe the definition used is that a composite must have as factors 1, itself and at least one other number. One does not meet this specific wording. Whereas 9 has 1,3 and 9 as factors.

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Q: Why is number 1 not a composite number?
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