Q: Is 221,320 a Prime Number?
A: No, 221,320 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 221320 can be evenly divided by 1 2 4 5 8 10 11 20 22 40 44 55 88 110 220 440 503 1,006 2,012 2,515 4,024 5,030 5,533 10,060 11,066 20,120 22,132 27,665 44,264 55,330 110,660 and 221,320, with no remainder.
Since 221,320 cannot be divided by just 1 and 221,320, it is not a prime number.