Q: Is 421,508 a Prime Number?
A: No, 421,508 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 421508 can be evenly divided by 1 2 4 167 334 631 668 1,262 2,524 105,377 210,754 and 421,508, with no remainder.
Since 421,508 cannot be divided by just 1 and 421,508, it is not a prime number.