A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1352610 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 19 21 30 35 38 42 45 57 63 70 90 95 105 113 114 126 133 171 190 210 226 266 285 315 339 342 399 565 570 630 665 678 791 798 855 1,017 1,130 1,197 1,330 1,582 1,695 1,710 1,995 2,034 2,147 2,373 2,394 3,390 3,955 3,990 4,294 4,746 5,085 5,985 6,441 7,119 7,910 10,170 10,735 11,865 11,970 12,882 14,238 15,029 19,323 21,470 23,730 30,058 32,205 35,595 38,646 45,087 64,410 71,190 75,145 90,174 96,615 135,261 150,290 193,230 225,435 270,522 450,870 676,305 and 1,352,610, with no remainder.
Since 1,352,610 cannot be divided by just 1 and 1,352,610, it is not a prime number.