Q: Is 21,562,515 a Composite Number?

Why is 21,562,515 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 21,562,515 can be evenly divided by 1 3 5 9 13 15 29 31 39 41 45 65 87 93 117 123 145 155 195 205 261 279 369 377 403 435 465 533 585 615 899 1,131 1,189 1,209 1,271 1,305 1,395 1,599 1,845 1,885 2,015 2,665 2,697 3,393 3,567 3,627 3,813 4,495 4,797 5,655 5,945 6,045 6,355 7,995 8,091 10,701 11,439 11,687 13,485 15,457 16,523 16,965 17,835 18,135 19,065 23,985 35,061 36,859 40,455 46,371 49,569 53,505 57,195 58,435 77,285 82,615 105,183 110,577 139,113 148,707 175,305 184,295 231,855 247,845 331,731 479,167 525,915 552,885 695,565 743,535 1,437,501 1,658,655 2,395,835 4,312,503 7,187,505 and 21,562,515, with no remainder.

Since 21,562,515 cannot be divided by just 1 and 21,562,515, 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).