Q: Is 684 a Prime Number?
A: No, 684 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 684 can be evenly divided by 1 2 3 4 6 9 12 18 19 36 38 57 76 114 171 228 342 and 684, with no remainder.
Since 684 cannot be divided by just 1 and 684, it is not a prime number.