The number 3,602,970 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 19 21 30 35 38 42 43 45 49 57 63 70 86 90 95 98 105 114 126 129 133 147 171 190 210 215 245 258 266 285 294 301 315 342 387 399 430 441 490 570 602 630 645 665 735 774 798 817 855 882 903 931 1,197 1,290 1,330 1,470 1,505 1,634 1,710 1,806 1,862 1,935 1,995 2,107 2,205 2,394 2,451 2,709 2,793 3,010 3,870 3,990 4,085 4,214 4,410 4,515 4,655 4,902 5,418 5,586 5,719 5,985 6,321 7,353 8,170 8,379 9,030 9,310 10,535 11,438 11,970 12,255 12,642 13,545 13,965 14,706 16,758 17,157 18,963 21,070 24,510 27,090 27,930 28,595 31,605 34,314 36,765 37,926 40,033 41,895 51,471 57,190 63,210 73,530 80,066 83,790 85,785 94,815 102,942 120,099 171,570 189,630 200,165 240,198 257,355 360,297 400,330 514,710 600,495 720,594 1,200,990 1,801,485 and 3,602,970, with no remainder.
Since 3,602,970 cannot be divided by just 1 and 3,602,970, it is a composite number.