Q: Is 521,891 a Prime Number?
A: No, 521,891 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 521891 can be evenly divided by 1 43 53 229 2,279 9,847 12,137 and 521,891, with no remainder.
Since 521,891 cannot be divided by just 1 and 521,891, it is not a prime number.