Q: Is 21,406,770 a Composite Number?

Why is 21,406,770 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 21,406,770 can be evenly divided by 1 2 3 5 6 7 9 10 11 14 15 18 21 22 30 33 35 42 45 55 63 66 70 77 90 99 105 110 126 154 165 198 210 231 315 330 385 462 495 630 693 770 990 1,155 1,386 2,310 3,089 3,465 6,178 6,930 9,267 15,445 18,534 21,623 27,801 30,890 33,979 43,246 46,335 55,602 64,869 67,958 92,670 101,937 108,115 129,738 139,005 169,895 194,607 203,874 216,230 237,853 278,010 305,811 324,345 339,790 389,214 475,706 509,685 611,622 648,690 713,559 973,035 1,019,370 1,189,265 1,427,118 1,529,055 1,946,070 2,140,677 2,378,530 3,058,110 3,567,795 4,281,354 7,135,590 10,703,385 and 21,406,770, with no remainder.

Since 21,406,770 cannot be divided by just 1 and 21,406,770, 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).