The number 2,550,408 can be evenly divided by 1 2 3 4 6 7 8 12 14 17 19 21 24 28 34 38 42 47 51 56 57 68 76 84 94 102 114 119 133 136 141 152 168 188 204 228 238 266 282 323 329 357 376 399 408 456 476 532 564 646 658 714 798 799 893 952 969 987 1,064 1,128 1,292 1,316 1,428 1,596 1,598 1,786 1,938 1,974 2,261 2,397 2,584 2,632 2,679 2,856 3,192 3,196 3,572 3,876 3,948 4,522 4,794 5,358 5,593 6,251 6,392 6,783 7,144 7,752 7,896 9,044 9,588 10,716 11,186 12,502 13,566 15,181 16,779 18,088 18,753 19,176 21,432 22,372 25,004 27,132 30,362 33,558 37,506 44,744 45,543 50,008 54,264 60,724 67,116 75,012 91,086 106,267 121,448 134,232 150,024 182,172 212,534 318,801 364,344 425,068 637,602 850,136 1,275,204 and 2,550,408, with no remainder.
Since 2,550,408 cannot be divided by just 1 and 2,550,408, it is a composite number.