Q: Is 666 a Prime Number?
A: No, 666 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 666 can be evenly divided by 1 2 3 6 9 18 37 74 111 222 333 and 666, with no remainder.
Since 666 cannot be divided by just 1 and 666, it is not a prime number.