Q: Is 280,521 a Prime Number?
A: No, 280,521 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 280521 can be evenly divided by 1 3 9 71 213 439 639 1,317 3,951 31,169 93,507 and 280,521, with no remainder.
Since 280,521 cannot be divided by just 1 and 280,521, it is not a prime number.