Q: Is 478,521 a Prime Number?
A: No, 478,521 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 478521 can be evenly divided by 1 3 9 27 37 111 333 479 999 1,437 4,311 12,933 17,723 53,169 159,507 and 478,521, with no remainder.
Since 478,521 cannot be divided by just 1 and 478,521, it is not a prime number.