The number 6,446,016 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 19 24 31 32 36 38 48 57 62 64 72 76 93 96 114 124 144 152 171 186 192 228 248 279 288 304 342 361 372 456 496 558 576 589 608 684 722 744 912 992 1,083 1,116 1,178 1,216 1,368 1,444 1,488 1,767 1,824 1,984 2,166 2,232 2,356 2,736 2,888 2,976 3,249 3,534 3,648 4,332 4,464 4,712 5,301 5,472 5,776 5,952 6,498 7,068 8,664 8,928 9,424 10,602 10,944 11,191 11,552 12,996 14,136 17,328 17,856 18,848 21,204 22,382 23,104 25,992 28,272 33,573 34,656 37,696 42,408 44,764 51,984 56,544 67,146 69,312 84,816 89,528 100,719 103,968 113,088 134,292 169,632 179,056 201,438 207,936 268,584 339,264 358,112 402,876 537,168 716,224 805,752 1,074,336 1,611,504 2,148,672 3,223,008 and 6,446,016, with no remainder.
Since 6,446,016 cannot be divided by just 1 and 6,446,016, it is a composite number.