Q: Is 421,491 a Prime Number?
A: No, 421,491 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 421491 can be evenly divided by 1 3 7 21 20,071 60,213 140,497 and 421,491, with no remainder.
Since 421,491 cannot be divided by just 1 and 421,491, it is not a prime number.