Q: Is 21,554,550 a Composite Number?

Why is 21,554,550 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 21,554,550 can be evenly divided by 1 2 3 5 6 9 10 15 18 19 25 30 38 45 50 57 75 90 95 114 150 171 190 225 285 342 450 475 570 855 950 1,425 1,710 2,521 2,850 4,275 5,042 7,563 8,550 12,605 15,126 22,689 25,210 37,815 45,378 47,899 63,025 75,630 95,798 113,445 126,050 143,697 189,075 226,890 239,495 287,394 378,150 431,091 478,990 567,225 718,485 862,182 1,134,450 1,197,475 1,436,970 2,155,455 2,394,950 3,592,425 4,310,910 7,184,850 10,777,275 and 21,554,550, with no remainder.

Since 21,554,550 cannot be divided by just 1 and 21,554,550, 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).