A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1453140 can be evenly divided by 1 2 3 4 5 6 9 10 12 13 15 18 20 23 26 27 30 36 39 45 46 52 54 60 65 69 78 81 90 92 108 115 117 130 135 138 156 162 180 195 207 230 234 243 260 270 276 299 324 345 351 390 405 414 460 468 486 540 585 598 621 690 702 780 810 828 897 972 1,035 1,053 1,170 1,196 1,215 1,242 1,380 1,404 1,495 1,620 1,755 1,794 1,863 2,070 2,106 2,340 2,430 2,484 2,691 2,990 3,105 3,159 3,510 3,588 3,726 4,140 4,212 4,485 4,860 5,265 5,382 5,589 5,980 6,210 6,318 7,020 7,452 8,073 8,970 9,315 10,530 10,764 11,178 12,420 12,636 13,455 15,795 16,146 17,940 18,630 21,060 22,356 24,219 26,910 27,945 31,590 32,292 37,260 40,365 48,438 53,820 55,890 63,180 72,657 80,730 96,876 111,780 121,095 145,314 161,460 242,190 290,628 363,285 484,380 726,570 and 1,453,140, with no remainder.
Since 1,453,140 cannot be divided by just 1 and 1,453,140, it is not a prime number.