A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6797196 can be evenly divided by 1 2 3 4 6 7 9 12 14 18 21 27 28 36 37 42 54 63 74 81 84 108 111 126 148 162 189 222 243 252 259 324 333 378 444 486 518 567 666 729 756 777 972 999 1,036 1,134 1,332 1,458 1,554 1,701 1,998 2,187 2,268 2,331 2,916 2,997 3,108 3,402 3,996 4,374 4,662 5,103 5,994 6,561 6,804 6,993 8,748 8,991 9,324 10,206 11,988 13,122 13,986 15,309 17,982 20,412 20,979 26,244 26,973 27,972 30,618 35,964 41,958 45,927 53,946 61,236 62,937 80,919 83,916 91,854 107,892 125,874 161,838 183,708 188,811 242,757 251,748 323,676 377,622 485,514 566,433 755,244 971,028 1,132,866 1,699,299 2,265,732 3,398,598 and 6,797,196, with no remainder.
Since 6,797,196 cannot be divided by just 1 and 6,797,196, it is not a prime number.