Q: Is 1,816,815 a Composite Number?

Why is 1,816,815 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 1,816,815 can be evenly divided by 1 3 5 7 11 13 15 21 33 35 39 55 65 77 91 105 121 143 165 195 231 273 363 385 429 455 605 715 847 1,001 1,155 1,331 1,365 1,573 1,815 2,145 2,541 3,003 3,993 4,235 4,719 5,005 6,655 7,865 9,317 11,011 12,705 15,015 17,303 19,965 23,595 27,951 33,033 46,585 51,909 55,055 86,515 121,121 139,755 165,165 259,545 363,363 605,605 and 1,816,815, with no remainder.

Since 1,816,815 cannot be divided by just 1 and 1,816,815, 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).