Q: Is 428,643 a Prime Number?

A: No, 428,643 is not a prime number.

Why is 428,643 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 428643 can be evenly divided by 1 3 9 97 291 491 873 1,473 4,419 47,627 142,881 and 428,643, with no remainder.

Since 428,643 cannot be divided by just 1 and 428,643, it is not a prime number.

Number	428,641	428,642	428,644	428,645
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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