A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3832640 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 28 29 32 35 40 56 58 59 64 70 80 112 116 118 140 145 160 203 224 232 236 280 290 295 320 406 413 448 464 472 560 580 590 812 826 928 944 1,015 1,120 1,160 1,180 1,624 1,652 1,711 1,856 1,888 2,030 2,065 2,240 2,320 2,360 3,248 3,304 3,422 3,776 4,060 4,130 4,640 4,720 6,496 6,608 6,844 8,120 8,260 8,555 9,280 9,440 11,977 12,992 13,216 13,688 16,240 16,520 17,110 18,880 23,954 26,432 27,376 32,480 33,040 34,220 47,908 54,752 59,885 64,960 66,080 68,440 95,816 109,504 119,770 132,160 136,880 191,632 239,540 273,760 383,264 479,080 547,520 766,528 958,160 1,916,320 and 3,832,640, with no remainder.
Since 3,832,640 cannot be divided by just 1 and 3,832,640, it is not a prime number.