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By factoring them. Prime numbers have only two factors. Composite numbers have three or more.

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11y ago
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12y ago

You first find all of the factors of the number. A Prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0.

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Q: How do you find prime and composite numbers?
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Related questions

Which is greater prime or composite numbers?

There are more composite numbers than prime numbers, but there is no prime or composite number so great that you can't find a greater one of either kind.


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Prime numbers are used to find the product of the prime factors of composite numbers.


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No, prime factorizations consist entirely of prime numbers.


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Factor it. Prime numbers have two factors, composite numbers have more than two.


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