Q: Is 666,021 a Prime Number?
A: No, 666,021 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 666021 can be evenly divided by 1 3 222,007 and 666,021, with no remainder.
Since 666,021 cannot be divided by just 1 and 666,021, it is not a prime number.