Q: Is 666,642 a Prime Number?
A: No, 666,642 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 666642 can be evenly divided by 1 2 3 6 137 274 411 811 822 1,622 2,433 4,866 111,107 222,214 333,321 and 666,642, with no remainder.
Since 666,642 cannot be divided by just 1 and 666,642, it is not a prime number.