Q: Is 21,418,878 a Composite Number?

Why is 21,418,878 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 21,418,878 can be evenly divided by 1 2 3 6 13 17 26 29 34 39 51 58 78 87 102 174 221 377 442 493 557 663 754 986 1,114 1,131 1,326 1,479 1,671 2,262 2,958 3,342 6,409 7,241 9,469 12,818 14,482 16,153 18,938 19,227 21,723 28,407 32,306 38,454 43,446 48,459 56,814 96,918 123,097 209,989 246,194 274,601 369,291 419,978 549,202 629,967 738,582 823,803 1,259,934 1,647,606 3,569,813 7,139,626 10,709,439 and 21,418,878, with no remainder.

Since 21,418,878 cannot be divided by just 1 and 21,418,878, 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).