Q: Is 420,399 a Prime Number?
A: No, 420,399 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 420399 can be evenly divided by 1 3 7 9 21 63 6,673 20,019 46,711 60,057 140,133 and 420,399, with no remainder.
Since 420,399 cannot be divided by just 1 and 420,399, it is not a prime number.