A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2215950 can be evenly divided by 1 2 3 5 6 10 11 15 17 22 25 30 33 34 50 51 55 66 75 79 85 102 110 150 158 165 170 187 237 255 275 330 374 395 425 474 510 550 561 790 825 850 869 935 1,122 1,185 1,275 1,343 1,650 1,738 1,870 1,975 2,370 2,550 2,607 2,686 2,805 3,950 4,029 4,345 4,675 5,214 5,610 5,925 6,715 8,058 8,690 9,350 11,850 13,035 13,430 14,025 14,773 20,145 21,725 26,070 28,050 29,546 33,575 40,290 43,450 44,319 65,175 67,150 73,865 88,638 100,725 130,350 147,730 201,450 221,595 369,325 443,190 738,650 1,107,975 and 2,215,950, with no remainder.
Since 2,215,950 cannot be divided by just 1 and 2,215,950, it is not a prime number.