Q: Is 687,564 a Prime Number?
A: No, 687,564 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 687564 can be evenly divided by 1 2 3 4 6 9 12 18 36 71 142 213 269 284 426 538 639 807 852 1,076 1,278 1,614 2,421 2,556 3,228 4,842 9,684 19,099 38,198 57,297 76,396 114,594 171,891 229,188 343,782 and 687,564, with no remainder.
Since 687,564 cannot be divided by just 1 and 687,564, it is not a prime number.