Q: Is 21,165,660 a Composite Number?

Why is 21,165,660 a composite number?

A composite number is a number that can be divided evenly by more numbers than 1 and itself. It is the opposite of a prime number.

The number 21,165,660 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 30 36 45 59 60 90 118 177 180 236 295 354 531 590 708 885 1,062 1,180 1,770 1,993 2,124 2,655 3,540 3,986 5,310 5,979 7,972 9,965 10,620 11,958 17,937 19,930 23,916 29,895 35,874 39,860 59,790 71,748 89,685 117,587 119,580 179,370 235,174 352,761 358,740 470,348 587,935 705,522 1,058,283 1,175,870 1,411,044 1,763,805 2,116,566 2,351,740 3,527,610 4,233,132 5,291,415 7,055,220 10,582,830 and 21,165,660, with no remainder.

Since 21,165,660 cannot be divided by just 1 and 21,165,660, it is a composite number.

More Examples

• All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).