Q: Is 687,920 a Prime Number?
A: No, 687,920 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 687920 can be evenly divided by 1 2 4 5 8 10 16 20 40 80 8,599 17,198 34,396 42,995 68,792 85,990 137,584 171,980 343,960 and 687,920, with no remainder.
Since 687,920 cannot be divided by just 1 and 687,920, it is not a prime number.