Q: Is 645,624 a Composite Number?

Why is 645,624 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 645,624 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 18 21 24 27 28 36 42 49 54 56 61 63 72 84 98 108 122 126 147 168 183 189 196 216 244 252 294 366 378 392 427 441 488 504 549 588 732 756 854 882 1,098 1,176 1,281 1,323 1,464 1,512 1,647 1,708 1,764 2,196 2,562 2,646 2,989 3,294 3,416 3,528 3,843 4,392 5,124 5,292 5,978 6,588 7,686 8,967 10,248 10,584 11,529 11,956 13,176 15,372 17,934 23,058 23,912 26,901 30,744 35,868 46,116 53,802 71,736 80,703 92,232 107,604 161,406 215,208 322,812 and 645,624, with no remainder.

Since 645,624 cannot be divided by just 1 and 645,624, 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).