Q: Is 21,320 a Prime Number?
A: No, 21,320 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 21320 can be evenly divided by 1 2 4 5 8 10 13 20 26 40 41 52 65 82 104 130 164 205 260 328 410 520 533 820 1,066 1,640 2,132 2,665 4,264 5,330 10,660 and 21,320, with no remainder.
Since 21,320 cannot be divided by just 1 and 21,320, it is not a prime number.