A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1527960 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 17 20 21 24 28 30 34 35 40 42 51 56 60 68 70 84 85 102 105 107 119 120 136 140 168 170 204 210 214 238 255 280 321 340 357 408 420 428 476 510 535 595 642 680 714 749 840 856 952 1,020 1,070 1,190 1,284 1,428 1,498 1,605 1,785 1,819 2,040 2,140 2,247 2,380 2,568 2,856 2,996 3,210 3,570 3,638 3,745 4,280 4,494 4,760 5,457 5,992 6,420 7,140 7,276 7,490 8,988 9,095 10,914 11,235 12,733 12,840 14,280 14,552 14,980 17,976 18,190 21,828 22,470 25,466 27,285 29,960 36,380 38,199 43,656 44,940 50,932 54,570 63,665 72,760 76,398 89,880 101,864 109,140 127,330 152,796 190,995 218,280 254,660 305,592 381,990 509,320 763,980 and 1,527,960, with no remainder.
Since 1,527,960 cannot be divided by just 1 and 1,527,960, it is not a prime number.