A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3884112 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 27 36 37 48 54 72 74 81 108 111 144 148 162 216 222 243 296 324 333 432 444 486 592 648 666 729 888 972 999 1,296 1,332 1,458 1,776 1,944 1,998 2,187 2,664 2,916 2,997 3,888 3,996 4,374 5,328 5,832 5,994 6,561 7,992 8,748 8,991 11,664 11,988 13,122 15,984 17,496 17,982 23,976 26,244 26,973 34,992 35,964 47,952 52,488 53,946 71,928 80,919 104,976 107,892 143,856 161,838 215,784 242,757 323,676 431,568 485,514 647,352 971,028 1,294,704 1,942,056 and 3,884,112, with no remainder.
Since 3,884,112 cannot be divided by just 1 and 3,884,112, it is not a prime number.