Q: Is 28,005 a Prime Number?

A: No, 28,005 is not a prime number.

Why is 28,005 not a prime number?

A prime number is a natural number, greater than one, that can only be divided by 1 and itself.

The number 28005 can be evenly divided by 1 3 5 15 1,867 5,601 9,335 and 28,005, with no remainder.

Since 28,005 cannot be divided by just 1 and 28,005, it is not a prime number.

Number	28,003	28,004	28,006	28,007
Prime?	no	no	no	no

All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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