A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2062440 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 90 102 120 136 153 170 180 204 255 306 337 340 360 408 510 612 674 680 765 1,011 1,020 1,224 1,348 1,530 1,685 2,022 2,040 2,696 3,033 3,060 3,370 4,044 5,055 5,729 6,066 6,120 6,740 8,088 10,110 11,458 12,132 13,480 15,165 17,187 20,220 22,916 24,264 28,645 30,330 34,374 40,440 45,832 51,561 57,290 60,660 68,748 85,935 103,122 114,580 121,320 137,496 171,870 206,244 229,160 257,805 343,740 412,488 515,610 687,480 1,031,220 and 2,062,440, with no remainder.
Since 2,062,440 cannot be divided by just 1 and 2,062,440, it is not a prime number.