A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1095480 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 17 18 20 24 30 34 36 40 45 51 60 68 72 85 90 102 120 136 153 170 179 180 204 255 306 340 358 360 408 510 537 612 680 716 765 895 1,020 1,074 1,224 1,432 1,530 1,611 1,790 2,040 2,148 2,685 3,043 3,060 3,222 3,580 4,296 5,370 6,086 6,120 6,444 7,160 8,055 9,129 10,740 12,172 12,888 15,215 16,110 18,258 21,480 24,344 27,387 30,430 32,220 36,516 45,645 54,774 60,860 64,440 73,032 91,290 109,548 121,720 136,935 182,580 219,096 273,870 365,160 547,740 and 1,095,480, with no remainder.
Since 1,095,480 cannot be divided by just 1 and 1,095,480, it is not a prime number.