Q: Is 521,997 a Prime Number?
A: No, 521,997 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 521997 can be evenly divided by 1 3 7 21 49 53 67 147 159 201 371 469 1,113 1,407 2,597 3,283 3,551 7,791 9,849 10,653 24,857 74,571 173,999 and 521,997, with no remainder.
Since 521,997 cannot be divided by just 1 and 521,997, it is not a prime number.