Q: Is 21,121,668 a Composite Number?

Why is 21,121,668 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 21,121,668 can be evenly divided by 1 2 3 4 6 9 12 18 27 36 54 108 223 446 669 877 892 1,338 1,754 2,007 2,631 2,676 3,508 4,014 5,262 6,021 7,893 8,028 10,524 12,042 15,786 23,679 24,084 31,572 47,358 94,716 195,571 391,142 586,713 782,284 1,173,426 1,760,139 2,346,852 3,520,278 5,280,417 7,040,556 10,560,834 and 21,121,668, with no remainder.

Since 21,121,668 cannot be divided by just 1 and 21,121,668, 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).