A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6035904 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 27 28 32 36 42 48 54 56 63 64 72 84 96 108 112 126 144 168 189 192 216 224 252 288 336 378 432 448 499 504 576 672 756 864 998 1,008 1,344 1,497 1,512 1,728 1,996 2,016 2,994 3,024 3,493 3,992 4,032 4,491 5,988 6,048 6,986 7,984 8,982 10,479 11,976 12,096 13,473 13,972 15,968 17,964 20,958 23,952 26,946 27,944 31,437 31,936 35,928 41,916 47,904 53,892 55,888 62,874 71,856 83,832 94,311 95,808 107,784 111,776 125,748 143,712 167,664 188,622 215,568 223,552 251,496 287,424 335,328 377,244 431,136 502,992 670,656 754,488 862,272 1,005,984 1,508,976 2,011,968 3,017,952 and 6,035,904, with no remainder.
Since 6,035,904 cannot be divided by just 1 and 6,035,904, it is not a prime number.