A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3341250 can be evenly divided by 1 2 3 5 6 9 10 11 15 18 22 25 27 30 33 45 50 54 55 66 75 81 90 99 110 125 135 150 162 165 198 225 243 250 270 275 297 330 375 405 450 486 495 550 594 625 675 750 810 825 891 990 1,125 1,215 1,250 1,350 1,375 1,485 1,650 1,782 1,875 2,025 2,250 2,430 2,475 2,673 2,750 2,970 3,375 3,750 4,050 4,125 4,455 4,950 5,346 5,625 6,075 6,750 6,875 7,425 8,250 8,910 10,125 11,250 12,150 12,375 13,365 13,750 14,850 16,875 20,250 20,625 22,275 24,750 26,730 30,375 33,750 37,125 41,250 44,550 50,625 60,750 61,875 66,825 74,250 101,250 111,375 123,750 133,650 151,875 185,625 222,750 303,750 334,125 371,250 556,875 668,250 1,113,750 1,670,625 and 3,341,250, with no remainder.
Since 3,341,250 cannot be divided by just 1 and 3,341,250, it is not a prime number.