Q: Is 687 a Prime Number?
A: No, 687 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 687 can be evenly divided by 1 3 229 and 687, with no remainder.
Since 687 cannot be divided by just 1 and 687, it is not a prime number.