Q: Is 668,221 a Prime Number?
A: Yes, 668,221 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 668221 can be evenly divided by 1 and 668,221, with no remainder.
Since 668,221 can be divided by just 1 and 668,221, it is a prime number.