A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1195560 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 27 30 36 40 41 45 54 60 72 81 82 90 108 120 123 135 162 164 180 205 216 243 246 270 324 328 360 369 405 410 486 492 540 615 648 729 738 810 820 972 984 1,080 1,107 1,215 1,230 1,458 1,476 1,620 1,640 1,845 1,944 2,214 2,430 2,460 2,916 2,952 3,240 3,321 3,645 3,690 4,428 4,860 4,920 5,535 5,832 6,642 7,290 7,380 8,856 9,720 9,963 11,070 13,284 14,580 14,760 16,605 19,926 22,140 26,568 29,160 29,889 33,210 39,852 44,280 49,815 59,778 66,420 79,704 99,630 119,556 132,840 149,445 199,260 239,112 298,890 398,520 597,780 and 1,195,560, with no remainder.
Since 1,195,560 cannot be divided by just 1 and 1,195,560, it is not a prime number.