A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1403010 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 17 18 21 30 34 35 42 45 51 63 70 85 90 102 105 119 126 131 153 170 210 238 255 262 306 315 357 393 510 595 630 655 714 765 786 917 1,071 1,179 1,190 1,310 1,530 1,785 1,834 1,965 2,142 2,227 2,358 2,751 3,570 3,930 4,454 4,585 5,355 5,502 5,895 6,681 8,253 9,170 10,710 11,135 11,790 13,362 13,755 15,589 16,506 20,043 22,270 27,510 31,178 33,405 40,086 41,265 46,767 66,810 77,945 82,530 93,534 100,215 140,301 155,890 200,430 233,835 280,602 467,670 701,505 and 1,403,010, with no remainder.
Since 1,403,010 cannot be divided by just 1 and 1,403,010, it is not a prime number.