Q: Is 21,384 a Prime Number?
A: No, 21,384 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 21384 can be evenly divided by 1 2 3 4 6 8 9 11 12 18 22 24 27 33 36 44 54 66 72 81 88 99 108 132 162 198 216 243 264 297 324 396 486 594 648 792 891 972 1,188 1,782 1,944 2,376 2,673 3,564 5,346 7,128 10,692 and 21,384, with no remainder.
Since 21,384 cannot be divided by just 1 and 21,384, it is not a prime number.