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Q: What is the first composite number after 21?

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The only composite factor of 21 is 21.

21 is a composite number

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 number because it has more than one number that goes into it

21 is composite.

Composite

Composite, 21=3*7

21 and 28 are composite.

The next composite number after 20 is 21.

It is: 49-28 = 21

Composite.

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

Who says it is? 21 is a composite number!

number 21 is prime

21 is an odd composite number

The first composite number is 4.

It is composite because it has more than two factors

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

21 is a composite number.

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

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

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. 21 is composite.

21 is a composite number. 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.

21 is a composite number because it has at least one positive factor other than one or itself.

19 and 23 are prime numbers whereas 21 is a composite number