A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1730610 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 30 35 41 42 45 63 67 70 82 90 105 123 126 134 201 205 210 246 287 315 335 369 402 410 469 574 603 615 630 670 738 861 938 1,005 1,206 1,230 1,407 1,435 1,722 1,845 2,010 2,345 2,583 2,747 2,814 2,870 3,015 3,690 4,221 4,305 4,690 5,166 5,494 6,030 7,035 8,241 8,442 8,610 12,915 13,735 14,070 16,482 19,229 21,105 24,723 25,830 27,470 38,458 41,205 42,210 49,446 57,687 82,410 96,145 115,374 123,615 173,061 192,290 247,230 288,435 346,122 576,870 865,305 and 1,730,610, with no remainder.
Since 1,730,610 cannot be divided by just 1 and 1,730,610, it is not a prime number.