A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3274560 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 32 36 40 45 48 54 60 64 72 80 90 96 108 120 135 144 160 180 192 216 240 270 288 320 360 379 432 480 540 576 720 758 864 960 1,080 1,137 1,440 1,516 1,728 1,895 2,160 2,274 2,880 3,032 3,411 3,790 4,320 4,548 5,685 6,064 6,822 7,580 8,640 9,096 10,233 11,370 12,128 13,644 15,160 17,055 18,192 20,466 22,740 24,256 27,288 30,320 34,110 36,384 40,932 45,480 51,165 54,576 60,640 68,220 72,768 81,864 90,960 102,330 109,152 121,280 136,440 163,728 181,920 204,660 218,304 272,880 327,456 363,840 409,320 545,760 654,912 818,640 1,091,520 1,637,280 and 3,274,560, with no remainder.
Since 3,274,560 cannot be divided by just 1 and 3,274,560, it is not a prime number.