The number 3,838,380 can be evenly divided by 1 2 3 4 5 6 7 10 12 13 14 15 19 20 21 26 28 30 35 37 38 39 42 52 57 60 65 70 74 76 78 84 91 95 105 111 114 130 133 140 148 156 182 185 190 195 210 222 228 247 259 260 266 273 285 364 370 380 390 399 420 444 455 481 494 518 532 546 555 570 665 703 740 741 777 780 798 910 962 988 1,036 1,092 1,110 1,140 1,235 1,295 1,330 1,365 1,406 1,443 1,482 1,554 1,596 1,729 1,820 1,924 1,995 2,109 2,220 2,405 2,470 2,590 2,660 2,730 2,812 2,886 2,964 3,108 3,367 3,458 3,515 3,705 3,885 3,990 4,218 4,810 4,921 4,940 5,180 5,187 5,460 5,772 6,734 6,916 7,030 7,215 7,410 7,770 7,980 8,436 8,645 9,139 9,620 9,842 10,101 10,374 10,545 13,468 14,060 14,430 14,763 14,820 15,540 16,835 17,290 18,278 19,684 20,202 20,748 21,090 24,605 25,935 27,417 28,860 29,526 33,670 34,580 36,556 40,404 42,180 45,695 49,210 50,505 51,870 54,834 59,052 63,973 67,340 73,815 91,390 98,420 101,010 103,740 109,668 127,946 137,085 147,630 182,780 191,919 202,020 255,892 274,170 295,260 319,865 383,838 548,340 639,730 767,676 959,595 1,279,460 1,919,190 and 3,838,380, with no remainder.
Since 3,838,380 cannot be divided by just 1 and 3,838,380, it is a composite number.