A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7119090 can be evenly divided by 1 2 3 5 6 9 10 11 15 17 18 22 27 30 33 34 45 47 51 54 55 66 81 85 90 94 99 102 110 135 141 153 162 165 170 187 198 235 255 270 282 297 306 330 374 405 423 459 470 495 510 517 561 594 705 765 799 810 846 891 918 935 990 1,034 1,122 1,269 1,377 1,410 1,485 1,530 1,551 1,598 1,683 1,782 1,870 2,115 2,295 2,397 2,538 2,585 2,754 2,805 2,970 3,102 3,366 3,807 3,995 4,230 4,455 4,590 4,653 4,794 5,049 5,170 5,610 6,345 6,885 7,191 7,614 7,755 7,990 8,415 8,789 8,910 9,306 10,098 11,985 12,690 13,770 13,959 14,382 15,147 15,510 16,830 17,578 19,035 21,573 23,265 23,970 25,245 26,367 27,918 30,294 35,955 38,070 41,877 43,146 43,945 46,530 50,490 52,734 64,719 69,795 71,910 75,735 79,101 83,754 87,890 107,865 129,438 131,835 139,590 151,470 158,202 209,385 215,730 237,303 263,670 323,595 395,505 418,770 474,606 647,190 711,909 791,010 1,186,515 1,423,818 2,373,030 3,559,545 and 7,119,090, with no remainder.
Since 7,119,090 cannot be divided by just 1 and 7,119,090, it is not a prime number.