The number 2,296,728 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 18 21 24 27 28 31 36 42 49 54 56 62 63 72 84 93 98 108 124 126 147 168 186 189 196 216 217 248 252 279 294 343 372 378 392 434 441 504 558 588 651 686 744 756 837 868 882 1,029 1,116 1,176 1,302 1,323 1,372 1,512 1,519 1,674 1,736 1,764 1,953 2,058 2,232 2,604 2,646 2,744 3,038 3,087 3,348 3,528 3,906 4,116 4,557 5,208 5,292 5,859 6,076 6,174 6,696 7,812 8,232 9,114 9,261 10,584 10,633 11,718 12,152 12,348 13,671 15,624 18,228 18,522 21,266 23,436 24,696 27,342 31,899 36,456 37,044 41,013 42,532 46,872 54,684 63,798 74,088 82,026 85,064 95,697 109,368 127,596 164,052 191,394 255,192 287,091 328,104 382,788 574,182 765,576 1,148,364 and 2,296,728, with no remainder.
Since 2,296,728 cannot be divided by just 1 and 2,296,728, it is a composite number.