The number 7,343,728 can be evenly divided by 1 2 4 7 8 14 16 17 19 28 29 34 38 49 56 58 68 76 98 112 116 119 133 136 152 196 203 232 238 266 272 304 323 392 406 464 476 493 532 551 646 784 812 833 931 952 986 1,064 1,102 1,292 1,421 1,624 1,666 1,862 1,904 1,972 2,128 2,204 2,261 2,584 2,842 3,248 3,332 3,451 3,724 3,857 3,944 4,408 4,522 5,168 5,684 6,664 6,902 7,448 7,714 7,888 8,816 9,044 9,367 11,368 13,328 13,804 14,896 15,428 15,827 18,088 18,734 22,736 24,157 26,999 27,608 30,856 31,654 36,176 37,468 48,314 53,998 55,216 61,712 63,308 65,569 74,936 96,628 107,996 126,616 131,138 149,872 193,256 215,992 253,232 262,276 386,512 431,984 458,983 524,552 917,966 1,049,104 1,835,932 3,671,864 and 7,343,728, with no remainder.
Since 7,343,728 cannot be divided by just 1 and 7,343,728, it is a composite number.