Q: Is 21,811,240 a Composite Number?

Why is 21,811,240 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 21,811,240 can be evenly divided by 1 2 4 5 8 10 11 19 20 22 38 40 44 55 76 88 95 110 152 190 209 220 380 418 440 760 836 1,045 1,672 2,090 2,609 4,180 5,218 8,360 10,436 13,045 20,872 26,090 28,699 49,571 52,180 57,398 99,142 104,360 114,796 143,495 198,284 229,592 247,855 286,990 396,568 495,710 545,281 573,980 991,420 1,090,562 1,147,960 1,982,840 2,181,124 2,726,405 4,362,248 5,452,810 10,905,620 and 21,811,240, with no remainder.

Since 21,811,240 cannot be divided by just 1 and 21,811,240, 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).