A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9869580 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 27 28 30 35 36 42 45 49 54 60 63 70 84 90 98 105 108 126 135 140 147 180 189 196 210 245 252 270 294 315 373 378 420 441 490 540 588 630 735 746 756 882 945 980 1,119 1,260 1,323 1,470 1,492 1,764 1,865 1,890 2,205 2,238 2,611 2,646 2,940 3,357 3,730 3,780 4,410 4,476 5,222 5,292 5,595 6,615 6,714 7,460 7,833 8,820 10,071 10,444 11,190 13,055 13,230 13,428 15,666 16,785 18,277 20,142 22,380 23,499 26,110 26,460 31,332 33,570 36,554 39,165 40,284 46,998 50,355 52,220 54,831 67,140 70,497 73,108 78,330 91,385 93,996 100,710 109,662 117,495 140,994 156,660 164,493 182,770 201,420 219,324 234,990 274,155 281,988 328,986 352,485 365,540 469,980 493,479 548,310 657,972 704,970 822,465 986,958 1,096,620 1,409,940 1,644,930 1,973,916 2,467,395 3,289,860 4,934,790 and 9,869,580, with no remainder.
Since 9,869,580 cannot be divided by just 1 and 9,869,580, it is not a prime number.