Q: Is 21,559,770 a Composite Number?

Why is 21,559,770 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 21,559,770 can be evenly divided by 1 2 3 5 6 9 10 15 18 27 30 43 45 54 81 86 90 129 135 162 215 258 270 387 405 430 619 645 774 810 1,161 1,238 1,290 1,857 1,935 2,322 3,095 3,483 3,714 3,870 5,571 5,805 6,190 6,966 9,285 11,142 11,610 16,713 17,415 18,570 26,617 27,855 33,426 34,830 50,139 53,234 55,710 79,851 83,565 100,278 133,085 159,702 167,130 239,553 250,695 266,170 399,255 479,106 501,390 718,659 798,510 1,197,765 1,437,318 2,155,977 2,395,530 3,593,295 4,311,954 7,186,590 10,779,885 and 21,559,770, with no remainder.

Since 21,559,770 cannot be divided by just 1 and 21,559,770, 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).