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It has more than two distinct factors; they are 1, 3, 9, 27, 81

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8y ago

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A composite number is a number that has more factors than just 1 and itself. 81 has 5 factors, 1, 3, 9, 27, 81, therefore, 81 is a composite number.

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8y ago
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81 is a composite number.

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8y ago
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It is divisible by 3.

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8y ago
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  1. 81, 27, 9, 3, ...
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Q: Why is 81 a composite?
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