Q: Is 21,315,042 a Composite Number?

Why is 21,315,042 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 21,315,042 can be evenly divided by 1 2 3 6 7 9 14 17 18 21 27 31 34 42 51 54 62 63 93 102 107 119 126 153 186 189 214 217 238 279 306 321 357 378 434 459 527 558 642 651 714 749 837 918 963 1,054 1,071 1,302 1,498 1,581 1,674 1,819 1,926 1,953 2,142 2,247 2,889 3,162 3,213 3,317 3,638 3,689 3,906 4,494 4,743 5,457 5,778 5,859 6,426 6,634 6,741 7,378 9,486 9,951 10,914 11,067 11,718 12,733 13,482 14,229 16,371 19,902 20,223 22,134 23,219 25,466 28,458 29,853 32,742 33,201 38,199 40,446 46,438 49,113 56,389 59,706 66,402 69,657 76,398 89,559 98,226 99,603 112,778 114,597 139,314 169,167 179,118 199,206 208,971 229,194 338,334 343,791 394,723 417,942 507,501 626,913 687,582 789,446 1,015,002 1,184,169 1,253,826 1,522,503 2,368,338 3,045,006 3,552,507 7,105,014 10,657,521 and 21,315,042, with no remainder.

Since 21,315,042 cannot be divided by just 1 and 21,315,042, 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).