Q: Is 421,818 a Prime Number?
A: No, 421,818 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 421818 can be evenly divided by 1 2 3 6 229 307 458 614 687 921 1,374 1,842 70,303 140,606 210,909 and 421,818, with no remainder.
Since 421,818 cannot be divided by just 1 and 421,818, it is not a prime number.