Q: Is 688,840 a Prime Number?
A: No, 688,840 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 688840 can be evenly divided by 1 2 4 5 8 10 17 20 34 40 68 85 136 170 340 680 1,013 2,026 4,052 5,065 8,104 10,130 17,221 20,260 34,442 40,520 68,884 86,105 137,768 172,210 344,420 and 688,840, with no remainder.
Since 688,840 cannot be divided by just 1 and 688,840, it is not a prime number.