Q: Is 421,318 a Prime Number?
A: No, 421,318 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 421318 can be evenly divided by 1 2 210,659 and 421,318, with no remainder.
Since 421,318 cannot be divided by just 1 and 421,318, it is not a prime number.