Q: Is 640,009 a Prime Number?

A: Yes, 640,009 is a prime number.

Why is 640,009 a prime number?

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

The number 640009 can be evenly divided by 1 and 640,009, with no remainder.

Since 640,009 can be divided by just 1 and 640,009, it is a prime number.

Number	640,007	640,008	640,010	640,011
Prime?	yes	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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