A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8075070 can be evenly divided by 1 2 3 5 6 9 10 15 18 23 30 45 46 47 69 83 90 94 115 138 141 166 207 230 235 249 282 345 414 415 423 470 498 690 705 747 830 846 1,035 1,081 1,245 1,410 1,494 1,909 2,070 2,115 2,162 2,490 3,243 3,735 3,818 3,901 4,230 5,405 5,727 6,486 7,470 7,802 9,545 9,729 10,810 11,454 11,703 16,215 17,181 19,090 19,458 19,505 23,406 28,635 32,430 34,362 35,109 39,010 48,645 57,270 58,515 70,218 85,905 89,723 97,290 117,030 171,810 175,545 179,446 269,169 351,090 448,615 538,338 807,507 897,230 1,345,845 1,615,014 2,691,690 4,037,535 and 8,075,070, with no remainder.
Since 8,075,070 cannot be divided by just 1 and 8,075,070, it is not a prime number.