Q: Is 21,287,280 a Composite Number?

Why is 21,287,280 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 21,287,280 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 24 28 30 35 40 42 48 56 60 70 80 84 105 112 120 140 168 210 240 280 336 420 560 840 1,680 12,671 25,342 38,013 50,684 63,355 76,026 88,697 101,368 126,710 152,052 177,394 190,065 202,736 253,420 266,091 304,104 354,788 380,130 443,485 506,840 532,182 608,208 709,576 760,260 886,970 1,013,680 1,064,364 1,330,455 1,419,152 1,520,520 1,773,940 2,128,728 2,660,910 3,041,040 3,547,880 4,257,456 5,321,820 7,095,760 10,643,640 and 21,287,280, with no remainder.

Since 21,287,280 cannot be divided by just 1 and 21,287,280, 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).