A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1219050 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 25 27 30 35 42 43 45 50 54 63 70 75 81 86 90 105 126 129 135 150 162 175 189 210 215 225 258 270 301 315 350 378 387 405 430 450 525 567 602 630 645 675 774 810 903 945 1,050 1,075 1,134 1,161 1,290 1,350 1,505 1,575 1,806 1,890 1,935 2,025 2,150 2,322 2,709 2,835 3,010 3,150 3,225 3,483 3,870 4,050 4,515 4,725 5,418 5,670 5,805 6,450 6,966 7,525 8,127 9,030 9,450 9,675 11,610 13,545 14,175 15,050 16,254 17,415 19,350 22,575 24,381 27,090 28,350 29,025 34,830 40,635 45,150 48,762 58,050 67,725 81,270 87,075 121,905 135,450 174,150 203,175 243,810 406,350 609,525 and 1,219,050, with no remainder.
Since 1,219,050 cannot be divided by just 1 and 1,219,050, it is not a prime number.