Q: Is 21,283,640 a Composite Number?

Why is 21,283,640 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 21,283,640 can be evenly divided by 1 2 4 5 7 8 10 14 20 28 35 40 49 56 70 98 140 196 245 280 392 490 980 1,960 10,859 21,718 43,436 54,295 76,013 86,872 108,590 152,026 217,180 304,052 380,065 434,360 532,091 608,104 760,130 1,064,182 1,520,260 2,128,364 2,660,455 3,040,520 4,256,728 5,320,910 10,641,820 and 21,283,640, with no remainder.

Since 21,283,640 cannot be divided by just 1 and 21,283,640, 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).