The number 4,402,728 can be evenly divided by 1 2 3 4 6 8 9 11 12 17 18 22 24 27 33 34 36 44 51 54 66 68 72 88 99 102 108 109 132 136 153 187 198 204 216 218 264 297 306 327 374 396 408 436 459 561 594 612 654 748 792 872 918 981 1,122 1,188 1,199 1,224 1,308 1,496 1,683 1,836 1,853 1,962 2,244 2,376 2,398 2,616 2,943 3,366 3,597 3,672 3,706 3,924 4,488 4,796 5,049 5,559 5,886 6,732 7,194 7,412 7,848 9,592 10,098 10,791 11,118 11,772 13,464 14,388 14,824 16,677 20,196 20,383 21,582 22,236 23,544 28,776 32,373 33,354 40,392 40,766 43,164 44,472 50,031 61,149 64,746 66,708 81,532 86,328 100,062 122,298 129,492 133,416 163,064 183,447 200,124 244,596 258,984 366,894 400,248 489,192 550,341 733,788 1,100,682 1,467,576 2,201,364 and 4,402,728, with no remainder.
Since 4,402,728 cannot be divided by just 1 and 4,402,728, it is a composite number.