Q: Is 991,521 a Prime Number?
A: No, 991,521 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 991521 can be evenly divided by 1 3 9 27 81 12,241 36,723 110,169 330,507 and 991,521, with no remainder.
Since 991,521 cannot be divided by just 1 and 991,521, it is not a prime number.