The number 2,142,288 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 19 24 27 29 36 38 48 54 57 58 72 76 81 87 108 114 116 144 152 162 171 174 216 228 232 243 261 304 324 342 348 432 456 464 486 513 522 551 648 684 696 783 912 972 1,026 1,044 1,102 1,296 1,368 1,392 1,539 1,566 1,653 1,944 2,052 2,088 2,204 2,349 2,736 3,078 3,132 3,306 3,888 4,104 4,176 4,408 4,617 4,698 4,959 6,156 6,264 6,612 7,047 8,208 8,816 9,234 9,396 9,918 12,312 12,528 13,224 14,094 14,877 18,468 18,792 19,836 24,624 26,448 28,188 29,754 36,936 37,584 39,672 44,631 56,376 59,508 73,872 79,344 89,262 112,752 119,016 133,893 178,524 238,032 267,786 357,048 535,572 714,096 1,071,144 and 2,142,288, with no remainder.
Since 2,142,288 cannot be divided by just 1 and 2,142,288, it is a composite number.