The number 3,264,768 can be evenly divided by 1 2 3 4 6 8 9 12 13 16 18 24 26 32 36 39 48 52 64 72 78 96 104 109 117 128 144 156 192 208 218 234 256 288 312 327 384 416 436 468 576 624 654 768 832 872 936 981 1,152 1,248 1,308 1,417 1,664 1,744 1,872 1,962 2,304 2,496 2,616 2,834 3,328 3,488 3,744 3,924 4,251 4,992 5,232 5,668 6,976 7,488 7,848 8,502 9,984 10,464 11,336 12,753 13,952 14,976 15,696 17,004 20,928 22,672 25,506 27,904 29,952 31,392 34,008 41,856 45,344 51,012 62,784 68,016 83,712 90,688 102,024 125,568 136,032 181,376 204,048 251,136 272,064 362,752 408,096 544,128 816,192 1,088,256 1,632,384 and 3,264,768, with no remainder.
Since 3,264,768 cannot be divided by just 1 and 3,264,768, it is a composite number.