The number 6,856,512 can be evenly divided by 1 2 3 4 6 8 12 13 16 24 26 32 39 41 48 52 64 67 78 82 96 104 123 134 156 164 192 201 208 246 268 312 328 402 416 492 533 536 624 656 804 832 871 984 1,066 1,072 1,248 1,312 1,599 1,608 1,742 1,968 2,132 2,144 2,496 2,613 2,624 2,747 3,198 3,216 3,484 3,936 4,264 4,288 5,226 5,494 6,396 6,432 6,968 7,872 8,241 8,528 10,452 10,988 12,792 12,864 13,936 16,482 17,056 20,904 21,976 25,584 27,872 32,964 34,112 35,711 41,808 43,952 51,168 55,744 65,928 71,422 83,616 87,904 102,336 107,133 131,856 142,844 167,232 175,808 214,266 263,712 285,688 428,532 527,424 571,376 857,064 1,142,752 1,714,128 2,285,504 3,428,256 and 6,856,512, with no remainder.
Since 6,856,512 cannot be divided by just 1 and 6,856,512, it is a composite number.