The number 6,580,224 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 17 18 21 24 27 28 32 34 36 42 48 51 54 56 63 64 68 72 84 96 102 108 112 119 126 128 136 144 153 168 189 192 204 216 224 238 252 256 272 288 306 336 357 378 384 408 432 448 459 476 504 512 544 576 612 672 714 756 768 816 864 896 918 952 1,008 1,024 1,071 1,088 1,152 1,224 1,344 1,428 1,512 1,536 1,632 1,728 1,792 1,836 1,904 2,016 2,048 2,142 2,176 2,304 2,448 2,688 2,856 3,024 3,072 3,213 3,264 3,456 3,584 3,672 3,808 4,032 4,284 4,352 4,608 4,896 5,376 5,712 6,048 6,144 6,426 6,528 6,912 7,168 7,344 7,616 8,064 8,568 8,704 9,216 9,792 10,752 11,424 12,096 12,852 13,056 13,824 14,336 14,688 15,232 16,128 17,136 17,408 18,432 19,584 21,504 22,848 24,192 25,704 26,112 27,648 29,376 30,464 32,256 34,272 34,816 39,168 43,008 45,696 48,384 51,408 52,224 55,296 58,752 60,928 64,512 68,544 78,336 91,392 96,768 102,816 104,448 117,504 121,856 129,024 137,088 156,672 182,784 193,536 205,632 235,008 243,712 274,176 313,344 365,568 387,072 411,264 470,016 548,352 731,136 822,528 940,032 1,096,704 1,645,056 2,193,408 3,290,112 and 6,580,224, with no remainder.
Since 6,580,224 cannot be divided by just 1 and 6,580,224, it is a composite number.