Q: Is 21,351,680 a Composite Number?

Why is 21,351,680 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 21,351,680 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 28 32 35 40 56 64 70 80 112 128 140 160 224 256 280 320 448 560 640 896 1,120 1,280 1,792 2,240 2,383 4,480 4,766 8,960 9,532 11,915 16,681 19,064 23,830 33,362 38,128 47,660 66,724 76,256 83,405 95,320 133,448 152,512 166,810 190,640 266,896 305,024 333,620 381,280 533,792 610,048 667,240 762,560 1,067,584 1,334,480 1,525,120 2,135,168 2,668,960 3,050,240 4,270,336 5,337,920 10,675,840 and 21,351,680, with no remainder.

Since 21,351,680 cannot be divided by just 1 and 21,351,680, 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).