Q: Is 21,978 a Composite Number?
A: Yes, 21,978 is a composite number.
The number 21,978 can be evenly divided by 1 2 3 6 9 11 18 22 27 33 37 54 66 74 99 111 198 222 297 333 407 594 666 814 999 1,221 1,998 2,442 3,663 7,326 10,989 and 21,978, with no remainder.
Since 21,978 cannot be divided by just 1 and 21,978, it is a composite number.