Q: Is 521,389 a Prime Number?
A: No, 521,389 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 521389 can be evenly divided by 1 11 31 121 139 341 1,529 3,751 4,309 16,819 47,399 and 521,389, with no remainder.
Since 521,389 cannot be divided by just 1 and 521,389, it is not a prime number.