A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2698410 can be evenly divided by 1 2 3 5 6 10 11 13 15 17 22 26 30 33 34 37 39 51 55 65 66 74 78 85 102 110 111 130 143 165 170 185 187 195 221 222 255 286 330 370 374 390 407 429 442 481 510 555 561 629 663 715 814 858 935 962 1,105 1,110 1,122 1,221 1,258 1,326 1,430 1,443 1,870 1,887 2,035 2,145 2,210 2,405 2,431 2,442 2,805 2,886 3,145 3,315 3,774 4,070 4,290 4,810 4,862 5,291 5,610 6,105 6,290 6,630 6,919 7,215 7,293 8,177 9,435 10,582 12,155 12,210 13,838 14,430 14,586 15,873 16,354 18,870 20,757 24,310 24,531 26,455 31,746 34,595 36,465 40,885 41,514 49,062 52,910 69,190 72,930 79,365 81,770 89,947 103,785 122,655 158,730 179,894 207,570 245,310 269,841 449,735 539,682 899,470 1,349,205 and 2,698,410, with no remainder.
Since 2,698,410 cannot be divided by just 1 and 2,698,410, it is not a prime number.