Q: Is 646,420 a Prime Number?
A: No, 646,420 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 646420 can be evenly divided by 1 2 4 5 10 20 32,321 64,642 129,284 161,605 323,210 and 646,420, with no remainder.
Since 646,420 cannot be divided by just 1 and 646,420, it is not a prime number.