Q: Is 721,728 a Composite Number?

Why is 721,728 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 721,728 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 28 32 36 42 48 56 63 64 72 84 96 112 126 144 168 179 192 224 252 288 336 358 448 504 537 576 672 716 1,008 1,074 1,253 1,344 1,432 1,611 2,016 2,148 2,506 2,864 3,222 3,759 4,032 4,296 5,012 5,728 6,444 7,518 8,592 10,024 11,277 11,456 12,888 15,036 17,184 20,048 22,554 25,776 30,072 34,368 40,096 45,108 51,552 60,144 80,192 90,216 103,104 120,288 180,432 240,576 360,864 and 721,728, with no remainder.

Since 721,728 cannot be divided by just 1 and 721,728, 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).