Q: Is 21,411,225 a Composite Number?

Why is 21,411,225 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 21,411,225 can be evenly divided by 1 3 5 9 11 15 25 33 41 45 55 75 99 123 165 205 211 225 275 369 451 495 615 633 825 1,025 1,055 1,353 1,845 1,899 2,255 2,321 2,475 3,075 3,165 4,059 5,275 6,765 6,963 8,651 9,225 9,495 11,275 11,605 15,825 20,295 20,889 25,953 33,825 34,815 43,255 47,475 58,025 77,859 95,161 101,475 104,445 129,765 174,075 216,275 285,483 389,295 475,805 522,225 648,825 856,449 1,427,415 1,946,475 2,379,025 4,282,245 7,137,075 and 21,411,225, with no remainder.

Since 21,411,225 cannot be divided by just 1 and 21,411,225, 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).