Q: Is 21,066,840 a Composite Number?

Why is 21,066,840 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 21,066,840 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 30 36 40 45 60 72 90 120 139 180 278 360 417 421 556 695 834 842 1,112 1,251 1,263 1,390 1,668 1,684 2,085 2,105 2,502 2,526 2,780 3,336 3,368 3,789 4,170 4,210 5,004 5,052 5,560 6,255 6,315 7,578 8,340 8,420 10,008 10,104 12,510 12,630 15,156 16,680 16,840 18,945 25,020 25,260 30,312 37,890 50,040 50,520 58,519 75,780 117,038 151,560 175,557 234,076 292,595 351,114 468,152 526,671 585,190 702,228 877,785 1,053,342 1,170,380 1,404,456 1,755,570 2,106,684 2,340,760 2,633,355 3,511,140 4,213,368 5,266,710 7,022,280 10,533,420 and 21,066,840, with no remainder.

Since 21,066,840 cannot be divided by just 1 and 21,066,840, 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).