A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7559370 can be evenly divided by 1 2 3 5 6 7 9 10 13 14 15 18 21 26 30 35 39 42 45 63 65 70 71 78 90 91 105 117 126 130 142 169 182 195 210 213 234 273 315 338 355 390 426 455 497 507 546 585 630 639 710 819 845 910 923 994 1,014 1,065 1,170 1,183 1,278 1,365 1,491 1,521 1,638 1,690 1,846 2,130 2,366 2,485 2,535 2,730 2,769 2,982 3,042 3,195 3,549 4,095 4,473 4,615 4,970 5,070 5,538 5,915 6,390 6,461 7,098 7,455 7,605 8,190 8,307 8,946 9,230 10,647 11,830 11,999 12,922 13,845 14,910 15,210 16,614 17,745 19,383 21,294 22,365 23,998 27,690 32,305 35,490 35,997 38,766 41,535 44,730 53,235 58,149 59,995 64,610 71,994 83,070 83,993 96,915 106,470 107,991 116,298 119,990 167,986 179,985 193,830 215,982 251,979 290,745 359,970 419,965 503,958 539,955 581,490 755,937 839,930 1,079,910 1,259,895 1,511,874 2,519,790 3,779,685 and 7,559,370, with no remainder.
Since 7,559,370 cannot be divided by just 1 and 7,559,370, it is not a prime number.