The number 3,801,420 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 28 30 35 36 42 45 49 60 63 70 84 90 98 105 126 140 147 180 196 210 245 252 294 315 420 431 441 490 588 630 735 862 882 980 1,260 1,293 1,470 1,724 1,764 2,155 2,205 2,586 2,940 3,017 3,879 4,310 4,410 5,172 6,034 6,465 7,758 8,620 8,820 9,051 12,068 12,930 15,085 15,516 18,102 19,395 21,119 25,860 27,153 30,170 36,204 38,790 42,238 45,255 54,306 60,340 63,357 77,580 84,476 90,510 105,595 108,612 126,714 135,765 181,020 190,071 211,190 253,428 271,530 316,785 380,142 422,380 543,060 633,570 760,284 950,355 1,267,140 1,900,710 and 3,801,420, with no remainder.
Since 3,801,420 cannot be divided by just 1 and 3,801,420, it is a composite number.