Q: Is 421,618 a Prime Number?
A: No, 421,618 is 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 421618 can be evenly divided by 1 2 210,809 and 421,618, with no remainder.
Since 421,618 cannot be divided by just 1 and 421,618, it is not a prime number.