The number 3,278,184 can be evenly divided by 1 2 3 4 6 7 8 12 13 14 19 21 24 26 28 38 39 42 52 56 57 76 78 79 84 91 104 114 133 152 156 158 168 182 228 237 247 266 273 312 316 364 399 456 474 494 532 546 553 632 728 741 798 948 988 1,027 1,064 1,092 1,106 1,482 1,501 1,596 1,659 1,729 1,896 1,976 2,054 2,184 2,212 2,964 3,002 3,081 3,192 3,318 3,458 4,108 4,424 4,503 5,187 5,928 6,004 6,162 6,636 6,916 7,189 8,216 9,006 10,374 10,507 12,008 12,324 13,272 13,832 14,378 18,012 19,513 20,748 21,014 21,567 24,648 28,756 31,521 36,024 39,026 41,496 42,028 43,134 57,512 58,539 63,042 78,052 84,056 86,268 117,078 126,084 136,591 156,104 172,536 234,156 252,168 273,182 409,773 468,312 546,364 819,546 1,092,728 1,639,092 and 3,278,184, with no remainder.
Since 3,278,184 cannot be divided by just 1 and 3,278,184, it is a composite number.