A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3184200 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 25 29 30 36 40 45 50 58 60 61 72 75 87 90 100 116 120 122 145 150 174 180 183 200 225 232 244 261 290 300 305 348 360 366 435 450 488 522 549 580 600 610 696 725 732 870 900 915 1,044 1,098 1,160 1,220 1,305 1,450 1,464 1,525 1,740 1,769 1,800 1,830 2,088 2,175 2,196 2,440 2,610 2,745 2,900 3,050 3,480 3,538 3,660 4,350 4,392 4,575 5,220 5,307 5,490 5,800 6,100 6,525 7,076 7,320 8,700 8,845 9,150 10,440 10,614 10,980 12,200 13,050 13,725 14,152 15,921 17,400 17,690 18,300 21,228 21,960 26,100 26,535 27,450 31,842 35,380 36,600 42,456 44,225 52,200 53,070 54,900 63,684 70,760 79,605 88,450 106,140 109,800 127,368 132,675 159,210 176,900 212,280 265,350 318,420 353,800 398,025 530,700 636,840 796,050 1,061,400 1,592,100 and 3,184,200, with no remainder.
Since 3,184,200 cannot be divided by just 1 and 3,184,200, it is not a prime number.