A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2527560 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 14 15 17 18 20 21 24 28 30 34 35 36 40 42 45 51 56 59 60 63 68 70 72 84 85 90 102 105 118 119 120 126 136 140 153 168 170 177 180 204 210 236 238 252 255 280 295 306 315 340 354 357 360 408 413 420 472 476 504 510 531 590 595 612 630 680 708 714 765 826 840 885 952 1,003 1,020 1,062 1,071 1,180 1,190 1,224 1,239 1,260 1,416 1,428 1,530 1,652 1,770 1,785 2,006 2,040 2,065 2,124 2,142 2,360 2,380 2,478 2,520 2,655 2,856 3,009 3,060 3,304 3,540 3,570 3,717 4,012 4,130 4,248 4,284 4,760 4,956 5,015 5,310 5,355 6,018 6,120 6,195 7,021 7,080 7,140 7,434 8,024 8,260 8,568 9,027 9,912 10,030 10,620 10,710 12,036 12,390 14,042 14,280 14,868 15,045 16,520 18,054 18,585 20,060 21,063 21,240 21,420 24,072 24,780 28,084 29,736 30,090 35,105 36,108 37,170 40,120 42,126 42,840 45,135 49,560 56,168 60,180 63,189 70,210 72,216 74,340 84,252 90,270 105,315 120,360 126,378 140,420 148,680 168,504 180,540 210,630 252,756 280,840 315,945 361,080 421,260 505,512 631,890 842,520 1,263,780 and 2,527,560, with no remainder.
Since 2,527,560 cannot be divided by just 1 and 2,527,560, it is not a prime number.