The number 3,138,192 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 19 24 31 36 37 38 48 57 62 72 74 76 93 111 114 124 144 148 152 171 186 222 228 248 279 296 304 333 342 372 444 456 496 558 589 592 666 684 703 744 888 912 1,116 1,147 1,178 1,332 1,368 1,406 1,488 1,767 1,776 2,109 2,232 2,294 2,356 2,664 2,736 2,812 3,441 3,534 4,218 4,464 4,588 4,712 5,301 5,328 5,624 6,327 6,882 7,068 8,436 9,176 9,424 10,323 10,602 11,248 12,654 13,764 14,136 16,872 18,352 20,646 21,204 21,793 25,308 27,528 28,272 33,744 41,292 42,408 43,586 50,616 55,056 65,379 82,584 84,816 87,172 101,232 130,758 165,168 174,344 196,137 261,516 348,688 392,274 523,032 784,548 1,046,064 1,569,096 and 3,138,192, with no remainder.
Since 3,138,192 cannot be divided by just 1 and 3,138,192, it is a composite number.