A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1750014 can be evenly divided by 1 2 3 6 7 9 14 17 18 19 21 34 38 42 43 51 57 63 86 102 114 119 126 129 133 153 171 238 258 266 301 306 323 342 357 387 399 602 646 714 731 774 798 817 903 969 1,071 1,197 1,462 1,634 1,806 1,938 2,142 2,193 2,261 2,394 2,451 2,709 2,907 4,386 4,522 4,902 5,117 5,418 5,719 5,814 6,579 6,783 7,353 10,234 11,438 13,158 13,566 13,889 14,706 15,351 17,157 20,349 27,778 30,702 34,314 40,698 41,667 46,053 51,471 83,334 92,106 97,223 102,942 125,001 194,446 250,002 291,669 583,338 875,007 and 1,750,014, with no remainder.
Since 1,750,014 cannot be divided by just 1 and 1,750,014, it is not a prime number.