The number 3,789,072 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 27 28 36 42 48 49 54 56 63 72 84 98 108 112 126 144 147 168 179 189 196 216 252 294 336 358 378 392 432 441 504 537 588 716 756 784 882 1,008 1,074 1,176 1,253 1,323 1,432 1,512 1,611 1,764 2,148 2,352 2,506 2,646 2,864 3,024 3,222 3,528 3,759 4,296 4,833 5,012 5,292 6,444 7,056 7,518 8,592 8,771 9,666 10,024 10,584 11,277 12,888 15,036 17,542 19,332 20,048 21,168 22,554 25,776 26,313 30,072 33,831 35,084 38,664 45,108 52,626 60,144 67,662 70,168 77,328 78,939 90,216 105,252 135,324 140,336 157,878 180,432 210,504 236,817 270,648 315,756 421,008 473,634 541,296 631,512 947,268 1,263,024 1,894,536 and 3,789,072, with no remainder.
Since 3,789,072 cannot be divided by just 1 and 3,789,072, it is a composite number.