Q: Is 21,515,560 a Composite Number?

Why is 21,515,560 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 21,515,560 can be evenly divided by 1 2 4 5 8 10 11 20 22 40 44 55 88 107 110 214 220 428 440 457 535 856 914 1,070 1,177 1,828 2,140 2,285 2,354 3,656 4,280 4,570 4,708 5,027 5,885 9,140 9,416 10,054 11,770 18,280 20,108 23,540 25,135 40,216 47,080 48,899 50,270 97,798 100,540 195,596 201,080 244,495 391,192 488,990 537,889 977,980 1,075,778 1,955,960 2,151,556 2,689,445 4,303,112 5,378,890 10,757,780 and 21,515,560, with no remainder.

Since 21,515,560 cannot be divided by just 1 and 21,515,560, 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).