Q: Is 521,320 a Prime Number?
A: No, 521,320 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 521320 can be evenly divided by 1 2 4 5 8 10 20 40 13,033 26,066 52,132 65,165 104,264 130,330 260,660 and 521,320, with no remainder.
Since 521,320 cannot be divided by just 1 and 521,320, it is not a prime number.