Q: Is 21,808,740 a Composite Number?

Why is 21,808,740 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 21,808,740 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 30 43 60 79 86 107 129 158 172 214 215 237 258 316 321 395 428 430 474 516 535 642 645 790 860 948 1,070 1,185 1,284 1,290 1,580 1,605 2,140 2,370 2,580 3,210 3,397 4,601 4,740 6,420 6,794 8,453 9,202 10,191 13,588 13,803 16,906 16,985 18,404 20,382 23,005 25,359 27,606 33,812 33,970 40,764 42,265 46,010 50,718 50,955 55,212 67,940 69,015 84,530 92,020 101,436 101,910 126,795 138,030 169,060 203,820 253,590 276,060 363,479 507,180 726,958 1,090,437 1,453,916 1,817,395 2,180,874 3,634,790 4,361,748 5,452,185 7,269,580 10,904,370 and 21,808,740, with no remainder.

Since 21,808,740 cannot be divided by just 1 and 21,808,740, 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).