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90 has factors other than 1 and itself, so it is not a prime number. For example, 90 is 9 x 10, so it is a composite number.

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15y ago

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90 is composite. (Tip: all whole numbers ending in zero are composite).
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9y ago
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it is composite

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14y ago
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Q: Is 90 a prime or a composite number?
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