A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2384250 can be evenly divided by 1 2 3 5 6 10 11 15 17 22 25 30 33 34 50 51 55 66 75 85 102 110 125 150 165 170 187 250 255 275 289 330 374 375 425 510 550 561 578 750 825 850 867 935 1,122 1,275 1,375 1,445 1,650 1,734 1,870 2,125 2,550 2,750 2,805 2,890 3,179 4,125 4,250 4,335 4,675 5,610 6,358 6,375 7,225 8,250 8,670 9,350 9,537 12,750 14,025 14,450 15,895 19,074 21,675 23,375 28,050 31,790 36,125 43,350 46,750 47,685 70,125 72,250 79,475 95,370 108,375 140,250 158,950 216,750 238,425 397,375 476,850 794,750 1,192,125 and 2,384,250, with no remainder.
Since 2,384,250 cannot be divided by just 1 and 2,384,250, it is not a prime number.