A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1102140 can be evenly divided by 1 2 3 4 5 6 9 10 12 13 15 18 20 26 27 30 36 39 45 52 54 60 65 78 90 108 117 130 135 156 157 180 195 234 260 270 314 351 390 468 471 540 585 628 702 780 785 942 1,170 1,404 1,413 1,570 1,755 1,884 2,041 2,340 2,355 2,826 3,140 3,510 4,082 4,239 4,710 5,652 6,123 7,020 7,065 8,164 8,478 9,420 10,205 12,246 14,130 16,956 18,369 20,410 21,195 24,492 28,260 30,615 36,738 40,820 42,390 55,107 61,230 73,476 84,780 91,845 110,214 122,460 183,690 220,428 275,535 367,380 551,070 and 1,102,140, with no remainder.
Since 1,102,140 cannot be divided by just 1 and 1,102,140, it is not a prime number.