The number 3,390,816 can be evenly divided by 1 2 3 4 6 8 11 12 13 16 19 22 24 26 32 33 38 39 44 48 52 57 66 76 78 88 96 104 114 132 143 152 156 169 176 208 209 228 247 264 286 304 312 338 352 416 418 429 456 494 507 528 572 608 624 627 676 741 836 858 912 988 1,014 1,056 1,144 1,248 1,254 1,352 1,482 1,672 1,716 1,824 1,859 1,976 2,028 2,288 2,508 2,704 2,717 2,964 3,211 3,344 3,432 3,718 3,952 4,056 4,576 5,016 5,408 5,434 5,577 5,928 6,422 6,688 6,864 7,436 7,904 8,112 8,151 9,633 10,032 10,868 11,154 11,856 12,844 13,728 14,872 16,224 16,302 19,266 20,064 21,736 22,308 23,712 25,688 29,744 32,604 35,321 38,532 43,472 44,616 51,376 59,488 65,208 70,642 77,064 86,944 89,232 102,752 105,963 130,416 141,284 154,128 178,464 211,926 260,832 282,568 308,256 423,852 565,136 847,704 1,130,272 1,695,408 and 3,390,816, with no remainder.
Since 3,390,816 cannot be divided by just 1 and 3,390,816, it is a composite number.