Q: Is 678,668 a Prime Number?
A: No, 678,668 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 678668 can be evenly divided by 1 2 4 169,667 339,334 and 678,668, with no remainder.
Since 678,668 cannot be divided by just 1 and 678,668, it is not a prime number.