A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7579650 can be evenly divided by 1 2 3 5 6 10 13 15 23 25 26 30 39 46 50 65 69 75 78 115 130 138 150 169 195 230 299 325 338 345 390 507 575 598 650 690 845 897 975 1,014 1,150 1,495 1,690 1,725 1,794 1,950 2,197 2,535 2,990 3,450 3,887 4,225 4,394 4,485 5,070 6,591 7,475 7,774 8,450 8,970 10,985 11,661 12,675 13,182 14,950 19,435 21,970 22,425 23,322 25,350 32,955 38,870 44,850 50,531 54,925 58,305 65,910 97,175 101,062 109,850 116,610 151,593 164,775 194,350 252,655 291,525 303,186 329,550 505,310 583,050 757,965 1,263,275 1,515,930 2,526,550 3,789,825 and 7,579,650, with no remainder.
Since 7,579,650 cannot be divided by just 1 and 7,579,650, it is not a prime number.