A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3202290 can be evenly divided by 1 2 3 5 6 7 9 10 13 14 15 17 18 21 23 26 30 34 35 39 42 45 46 51 63 65 69 70 78 85 90 91 102 105 115 117 119 126 130 138 153 161 170 182 195 207 210 221 230 234 238 255 273 299 306 315 322 345 357 390 391 414 442 455 483 510 546 585 595 598 630 663 690 714 765 782 805 819 897 910 966 1,035 1,071 1,105 1,170 1,173 1,190 1,326 1,365 1,449 1,495 1,530 1,547 1,610 1,638 1,785 1,794 1,955 1,989 2,070 2,093 2,142 2,210 2,346 2,415 2,691 2,730 2,737 2,898 2,990 3,094 3,315 3,519 3,570 3,910 3,978 4,095 4,186 4,485 4,641 4,830 5,083 5,355 5,382 5,474 5,865 6,279 6,630 7,038 7,245 7,735 8,190 8,211 8,970 9,282 9,945 10,166 10,465 10,710 11,730 12,558 13,455 13,685 13,923 14,490 15,249 15,470 16,422 17,595 18,837 19,890 20,930 23,205 24,633 25,415 26,910 27,370 27,846 30,498 31,395 35,190 35,581 37,674 41,055 45,747 46,410 49,266 50,830 62,790 69,615 71,162 76,245 82,110 91,494 94,185 106,743 123,165 139,230 152,490 177,905 188,370 213,486 228,735 246,330 320,229 355,810 457,470 533,715 640,458 1,067,430 1,601,145 and 3,202,290, with no remainder.
Since 3,202,290 cannot be divided by just 1 and 3,202,290, it is not a prime number.