The number 2,258,928 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 27 28 36 42 48 54 56 63 72 81 83 84 108 112 126 144 162 166 168 189 216 243 249 252 324 332 336 378 432 486 498 504 567 581 648 664 747 756 972 996 1,008 1,134 1,162 1,296 1,328 1,494 1,512 1,701 1,743 1,944 1,992 2,241 2,268 2,324 2,988 3,024 3,402 3,486 3,888 3,984 4,482 4,536 4,648 5,229 5,976 6,723 6,804 6,972 8,964 9,072 9,296 10,458 11,952 13,446 13,608 13,944 15,687 17,928 20,169 20,916 26,892 27,216 27,888 31,374 35,856 40,338 41,832 47,061 53,784 62,748 80,676 83,664 94,122 107,568 125,496 141,183 161,352 188,244 250,992 282,366 322,704 376,488 564,732 752,976 1,129,464 and 2,258,928, with no remainder.
Since 2,258,928 cannot be divided by just 1 and 2,258,928, it is a composite number.