Q: Is 420,721 a Prime Number?
A: No, 420,721 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 420721 can be evenly divided by 1 7 60,103 and 420,721, with no remainder.
Since 420,721 cannot be divided by just 1 and 420,721, it is not a prime number.