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Q: Why is 21 a composite number?

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The only composite factor of 21 is 21.

21 is a composite number

The next composite number after 20 is 21.

Composite

21 is composite.

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.

Composite.

Composite, 21=3*7

21 and 28 are composite.

The first composite number greater than 21 is 22.

Who says it is? 21 is a composite number!

number 21 is prime

21 is a composite number because it has more than two factors

21 is an odd composite number

21 is a composite number.

21 is a composite number.

Yes.

It is: 22

No, they are three numbers, not one. 21 is composite.

The factors of 21 are 1, 3, 7, and 21. The only factor of 21 that is a composite number is 21.

It is composite. It is divisible by 3 and 7.yea

It is composite because it has more than two factors

21 is a Composite Number. A prime number is a whole number that only has two factors which are itself and one. A composite number has factors in addition to one and itself. 21 is divisible by 3 and 7.

It is a composite number because it has more than two factors

21 and 22 are consecutive composite numbers.