Q: Is 21,421,428 a Composite Number?

Why is 21,421,428 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 21,421,428 can be evenly divided by 1 2 3 4 6 7 12 14 17 21 28 34 42 49 51 68 84 98 102 119 147 196 204 238 294 357 476 588 714 833 1,428 1,666 2,143 2,499 3,332 4,286 4,998 6,429 8,572 9,996 12,858 15,001 25,716 30,002 36,431 45,003 60,004 72,862 90,006 105,007 109,293 145,724 180,012 210,014 218,586 255,017 315,021 420,028 437,172 510,034 630,042 765,051 1,020,068 1,260,084 1,530,102 1,785,119 3,060,204 3,570,238 5,355,357 7,140,476 10,710,714 and 21,421,428, with no remainder.

Since 21,421,428 cannot be divided by just 1 and 21,421,428, 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).