Q: Is 646,664 a Prime Number?
A: No, 646,664 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 646664 can be evenly divided by 1 2 4 8 80,833 161,666 323,332 and 646,664, with no remainder.
Since 646,664 cannot be divided by just 1 and 646,664, it is not a prime number.