Why is 51 a composite number?

Answer 1

Composite numbers are numbers that are not prime- that is, they are divisible by numbers besides 1 and themselves. 51 is actually divisible by 1, 3, 17, and 51, so it is composite.

Answer 2

A composite number is a number that has more factors in addition to ' 1 ' and itself.

The factors of 51 are 1, 3, 17, and 51.

It has two more factors in addition to ' 1 ' and itself. So it's a composite number.

Answer 3

It has more than two factors.

Answer 4

It has more than two factors.

Answer 5

51 is a multiple of 3.

Answer 6

Yes.