The number 3,307,248 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 17 18 21 24 28 34 36 42 48 51 56 63 68 72 84 102 112 119 126 136 144 153 168 193 204 238 252 272 306 336 357 386 408 476 504 579 612 714 772 816 952 1,008 1,071 1,158 1,224 1,351 1,428 1,544 1,737 1,904 2,142 2,316 2,448 2,702 2,856 3,088 3,281 3,474 4,053 4,284 4,632 5,404 5,712 6,562 6,948 8,106 8,568 9,264 9,843 10,808 12,159 13,124 13,896 16,212 17,136 19,686 21,616 22,967 24,318 26,248 27,792 29,529 32,424 39,372 45,934 48,636 52,496 59,058 64,848 68,901 78,744 91,868 97,272 118,116 137,802 157,488 183,736 194,544 206,703 236,232 275,604 367,472 413,406 472,464 551,208 826,812 1,102,416 1,653,624 and 3,307,248, with no remainder.
Since 3,307,248 cannot be divided by just 1 and 3,307,248, it is a composite number.