Q: Is 667,221 a Prime Number?
A: No, 667,221 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 667221 can be evenly divided by 1 3 37 111 6,011 18,033 222,407 and 667,221, with no remainder.
Since 667,221 cannot be divided by just 1 and 667,221, it is not a prime number.