The number 6,573,798 can be evenly divided by 1 2 3 6 7 9 11 14 17 18 21 22 27 31 33 34 42 51 54 62 63 66 77 81 93 99 102 119 126 153 154 162 186 187 189 198 217 231 238 279 297 306 341 357 374 378 434 459 462 527 558 561 567 594 651 682 693 714 837 891 918 1,023 1,054 1,071 1,122 1,134 1,302 1,309 1,377 1,386 1,581 1,674 1,683 1,782 1,953 2,046 2,079 2,142 2,387 2,511 2,618 2,754 3,069 3,162 3,213 3,366 3,689 3,906 3,927 4,158 4,743 4,774 5,022 5,049 5,797 5,859 6,138 6,237 6,426 7,161 7,378 7,854 9,207 9,486 9,639 10,098 11,067 11,594 11,718 11,781 12,474 14,229 14,322 15,147 17,391 17,577 18,414 19,278 21,483 22,134 23,562 27,621 28,458 30,294 33,201 34,782 35,154 35,343 40,579 42,687 42,966 52,173 55,242 64,449 66,402 70,686 81,158 85,374 99,603 104,346 106,029 121,737 128,898 156,519 193,347 199,206 212,058 243,474 298,809 313,038 365,211 386,694 469,557 597,618 730,422 939,114 1,095,633 2,191,266 3,286,899 and 6,573,798, with no remainder.
Since 6,573,798 cannot be divided by just 1 and 6,573,798, it is a composite number.