Q: Is 686 a Prime Number?
A: No, 686 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 686 can be evenly divided by 1 2 7 14 49 98 343 and 686, with no remainder.
Since 686 cannot be divided by just 1 and 686, it is not a prime number.