Q: Is 421,816 a Prime Number?
A: No, 421,816 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 421816 can be evenly divided by 1 2 4 8 52,727 105,454 210,908 and 421,816, with no remainder.
Since 421,816 cannot be divided by just 1 and 421,816, it is not a prime number.