Q: Is 21,305,550 a Composite Number?

Why is 21,305,550 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 21,305,550 can be evenly divided by 1 2 3 5 6 7 10 14 15 21 25 30 35 42 50 70 75 103 105 150 175 197 206 210 309 350 394 515 525 591 618 721 985 1,030 1,050 1,182 1,379 1,442 1,545 1,970 2,163 2,575 2,758 2,955 3,090 3,605 4,137 4,326 4,925 5,150 5,910 6,895 7,210 7,725 8,274 9,850 10,815 13,790 14,775 15,450 18,025 20,291 20,685 21,630 29,550 34,475 36,050 40,582 41,370 54,075 60,873 68,950 101,455 103,425 108,150 121,746 142,037 202,910 206,850 284,074 304,365 426,111 507,275 608,730 710,185 852,222 1,014,550 1,420,370 1,521,825 2,130,555 3,043,650 3,550,925 4,261,110 7,101,850 10,652,775 and 21,305,550, with no remainder.

Since 21,305,550 cannot be divided by just 1 and 21,305,550, 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).