Q: Is 687,139 a Prime Number?
A: Yes, 687,139 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 687139 can be evenly divided by 1 and 687,139, with no remainder.
Since 687,139 can be divided by just 1 and 687,139, it is a prime number.