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Q: Which number is a composite number 47 13 17 21?

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21 and 28 are composite.

The only composite factor of 21 is 21.

Some are, some are not.

21 is a composite number

21 is divisible by 3 and 7, so it is composite. 91 is divisible by 7 and 13, so it is composite. 51 is divisible by 3 and 17. 31 is divisible by only 1 and itself, so it is the prime number.

The next composite number after 20 is 21.

Composite

seventeen 13 + 4 = 17 = 21 - 4

A composite number is a number that has more than two factors. The factors of 21 are 1, 3, 7, and 21. Therefore, 21 is a composite number.

21 is composite.

prime number: divisible by itself and 1. composite number: divisible by more than itself and 1. Prime: 2 3 7 17 23 composite: 6 9 18 21

Composite.

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