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A Prime number is a number with two and only two factors: 1 (also known as unity) and itself. A composite number is a number with more than two factors; in other words, it has at least one factor besides 1 and itself.

647 does not have factors other than 1 and itself, so it is a prime number.

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14y ago
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Q: Is 647 a prime number or a composite number?
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