Q: Is 421,635 a Prime Number?
A: No, 421,635 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 421635 can be evenly divided by 1 3 5 15 28,109 84,327 140,545 and 421,635, with no remainder.
Since 421,635 cannot be divided by just 1 and 421,635, it is not a prime number.