Q: Is 678 a Prime Number?
A: No, 678 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 678 can be evenly divided by 1 2 3 6 113 226 339 and 678, with no remainder.
Since 678 cannot be divided by just 1 and 678, it is not a prime number.