A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5340510 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 30 35 42 45 49 63 70 90 98 105 126 147 173 210 245 294 315 343 346 441 490 519 630 686 735 865 882 1,029 1,038 1,211 1,470 1,557 1,715 1,730 2,058 2,205 2,422 2,595 3,087 3,114 3,430 3,633 4,410 5,145 5,190 6,055 6,174 7,266 7,785 8,477 10,290 10,899 12,110 15,435 15,570 16,954 18,165 21,798 25,431 30,870 36,330 42,385 50,862 54,495 59,339 76,293 84,770 108,990 118,678 127,155 152,586 178,017 254,310 296,695 356,034 381,465 534,051 593,390 762,930 890,085 1,068,102 1,780,170 2,670,255 and 5,340,510, with no remainder.
Since 5,340,510 cannot be divided by just 1 and 5,340,510, it is not a prime number.