Q: Is 21,305,025 a Composite Number?

Why is 21,305,025 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 21,305,025 can be evenly divided by 1 3 5 7 9 15 21 25 27 35 45 63 75 81 105 135 167 175 189 225 243 315 405 501 525 567 675 729 835 945 1,169 1,215 1,503 1,575 1,701 2,025 2,505 2,835 3,507 3,645 4,175 4,509 4,725 5,103 5,845 6,075 7,515 8,505 10,521 12,525 13,527 14,175 17,535 18,225 22,545 25,515 29,225 31,563 37,575 40,581 42,525 52,605 67,635 87,675 94,689 112,725 121,743 127,575 157,815 202,905 263,025 284,067 338,175 473,445 608,715 789,075 852,201 1,014,525 1,420,335 2,367,225 3,043,575 4,261,005 7,101,675 and 21,305,025, with no remainder.

Since 21,305,025 cannot be divided by just 1 and 21,305,025, 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).