Q: Is 21,163,142 a Composite Number?

Why is 21,163,142 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 21,163,142 can be evenly divided by 1 2 7 11 13 14 22 26 31 62 77 91 121 143 154 182 217 242 286 341 403 434 682 806 847 961 1,001 1,573 1,694 1,922 2,002 2,387 2,821 3,146 3,751 4,433 4,774 5,642 6,727 7,502 8,866 10,571 11,011 12,493 13,454 21,142 22,022 24,986 26,257 31,031 48,763 52,514 62,062 73,997 87,451 97,526 116,281 137,423 147,994 174,902 232,562 274,846 341,341 682,682 813,967 961,961 1,511,653 1,627,934 1,923,922 3,023,306 10,581,571 and 21,163,142, with no remainder.

Since 21,163,142 cannot be divided by just 1 and 21,163,142, 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).