A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2003610 can be evenly divided by 1 2 3 5 6 7 10 14 15 21 29 30 35 42 47 49 58 70 87 94 98 105 141 145 147 174 203 210 235 245 282 290 294 329 406 435 470 490 609 658 705 735 870 987 1,015 1,218 1,363 1,410 1,421 1,470 1,645 1,974 2,030 2,303 2,726 2,842 3,045 3,290 4,089 4,263 4,606 4,935 6,090 6,815 6,909 7,105 8,178 8,526 9,541 9,870 11,515 13,630 13,818 14,210 19,082 20,445 21,315 23,030 28,623 34,545 40,890 42,630 47,705 57,246 66,787 69,090 95,410 133,574 143,115 200,361 286,230 333,935 400,722 667,870 1,001,805 and 2,003,610, with no remainder.
Since 2,003,610 cannot be divided by just 1 and 2,003,610, it is not a prime number.