Q: Is 21,390,900 a Composite Number?

Why is 21,390,900 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 21,390,900 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 25 30 50 60 75 100 113 150 226 300 339 452 565 631 678 1,130 1,262 1,356 1,695 1,893 2,260 2,524 2,825 3,155 3,390 3,786 5,650 6,310 6,780 7,572 8,475 9,465 11,300 12,620 15,775 16,950 18,930 31,550 33,900 37,860 47,325 63,100 71,303 94,650 142,606 189,300 213,909 285,212 356,515 427,818 713,030 855,636 1,069,545 1,426,060 1,782,575 2,139,090 3,565,150 4,278,180 5,347,725 7,130,300 10,695,450 and 21,390,900, with no remainder.

Since 21,390,900 cannot be divided by just 1 and 21,390,900, 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).