Q: Is 686,240 a Prime Number?
A: No, 686,240 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 686240 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 80 160 4,289 8,578 17,156 21,445 34,312 42,890 68,624 85,780 137,248 171,560 343,120 and 686,240, with no remainder.
Since 686,240 cannot be divided by just 1 and 686,240, it is not a prime number.