Q: Is 21,924 a Prime Number?
A: No, 21,924 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 21924 can be evenly divided by 1 2 3 4 6 7 9 12 14 18 21 27 28 29 36 42 54 58 63 84 87 108 116 126 174 189 203 252 261 348 378 406 522 609 756 783 812 1,044 1,218 1,566 1,827 2,436 3,132 3,654 5,481 7,308 10,962 and 21,924, with no remainder.
Since 21,924 cannot be divided by just 1 and 21,924, it is not a prime number.