A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2272320 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 96 108 120 135 144 160 180 192 216 240 263 270 288 320 360 432 480 526 540 576 720 789 864 960 1,052 1,080 1,315 1,440 1,578 1,728 2,104 2,160 2,367 2,630 2,880 3,156 3,945 4,208 4,320 4,734 5,260 6,312 7,101 7,890 8,416 8,640 9,468 10,520 11,835 12,624 14,202 15,780 16,832 18,936 21,040 23,670 25,248 28,404 31,560 35,505 37,872 42,080 47,340 50,496 56,808 63,120 71,010 75,744 84,160 94,680 113,616 126,240 142,020 151,488 189,360 227,232 252,480 284,040 378,720 454,464 568,080 757,440 1,136,160 and 2,272,320, with no remainder.
Since 2,272,320 cannot be divided by just 1 and 2,272,320, it is not a prime number.