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Q: How do you know it is composite?

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No it is a composite number if you want to know

A number is composite if it has more than two factors. Once you find a third, you know.

You know 120 is a composite number because it is an even number that is greater than 2.

dont know dont care

Composite: i know it can at least be divided by 2 and 3

We know that 28 is a composite number because:It is an even numberIt is divisible by more than 2 numbers

Composite numbers have more than two factors. Once you find a third factor, you know your number is composite.

Not that I know of.

No, if a number has even one additional factor besides itself and the number one, then you automatically know it's composite.

Yes, I want to know.

If you know a number is composite, then you also know that it can be factored into more factors than just 1 and itself. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

31 is prime.

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