Q: Is 21,879 a Composite Number?
A: Yes, 21,879 is a composite number.
The number 21,879 can be evenly divided by 1 3 9 11 13 17 33 39 51 99 117 143 153 187 221 429 561 663 1,287 1,683 1,989 2,431 7,293 and 21,879, with no remainder.
Since 21,879 cannot be divided by just 1 and 21,879, it is a composite number.