Q: Is 680 a Prime Number?
A: No, 680 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 680 can be evenly divided by 1 2 4 5 8 10 17 20 34 40 68 85 136 170 340 and 680, with no remainder.
Since 680 cannot be divided by just 1 and 680, it is not a prime number.