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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.

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Wiki User

15y ago

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Wiki User

12y ago

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.

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Wiki User

8y ago

It has more than two factors.

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Wiki User

8y ago

It has more than two factors.

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Wiki User

14y ago

51 is a multiple of 3.

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Wiki User

10y ago

Yes.

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Q: Why is 51 a composite number?
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