Q: Is 21,396,690 a Composite Number?

Why is 21,396,690 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 21,396,690 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 27 30 35 42 45 54 63 70 90 105 126 135 189 210 270 315 378 630 945 1,890 11,321 22,642 33,963 56,605 67,926 79,247 101,889 113,210 158,494 169,815 203,778 237,741 305,667 339,630 396,235 475,482 509,445 611,334 713,223 792,470 1,018,890 1,188,705 1,426,446 1,528,335 2,139,669 2,377,410 3,056,670 3,566,115 4,279,338 7,132,230 10,698,345 and 21,396,690, with no remainder.

Since 21,396,690 cannot be divided by just 1 and 21,396,690, 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).