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Try dividing by some numbers. The larger the number, the more numbers you have to divide by. It is enough to test division by 2, and all the odd numbers up to the square root of the number.

For very large numbers, this is not efficient. There are more efficient methods, but they are also more difficult to understand.

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14y ago

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You can tell it's a composite number if it can only be multiplied by 1 and itself.

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13y ago
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zaire harrell

Lvl 1
3y ago
How can you talk 4 is an composite num

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

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8y ago
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If a number has more than two factors, it's composite.

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8y ago
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Q: How can you tell if a number is a composite number?
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