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Q: Which number is a composite number 2312 or 3819 and how do you know?

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They are both composite numbers because they have more than two factors

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

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.

31 is prime.

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.

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

dont know dont care

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

It has more than two factors.

To know that a number is prime you need to know that it has no factors other than 1 and the number itself.To know that a number is composite you only need to know one factor other than the number itself or 1.

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