Q: Is 21,185,670 a Composite Number?

Why is 21,185,670 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 21,185,670 can be evenly divided by 1 2 3 5 6 10 11 15 22 30 33 43 55 66 86 110 129 165 215 258 330 430 473 645 946 1,290 1,419 1,493 2,365 2,838 2,986 4,479 4,730 7,095 7,465 8,958 14,190 14,930 16,423 22,395 32,846 44,790 49,269 64,199 82,115 98,538 128,398 164,230 192,597 246,345 320,995 385,194 492,690 641,990 706,189 962,985 1,412,378 1,925,970 2,118,567 3,530,945 4,237,134 7,061,890 10,592,835 and 21,185,670, with no remainder.

Since 21,185,670 cannot be divided by just 1 and 21,185,670, 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).