A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2273600 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 25 28 29 32 35 40 49 50 56 58 64 70 80 98 100 112 116 140 145 160 175 196 200 203 224 232 245 280 290 320 350 392 400 406 448 464 490 560 580 700 725 784 800 812 928 980 1,015 1,120 1,160 1,225 1,400 1,421 1,450 1,568 1,600 1,624 1,856 1,960 2,030 2,240 2,320 2,450 2,800 2,842 2,900 3,136 3,248 3,920 4,060 4,640 4,900 5,075 5,600 5,684 5,800 6,496 7,105 7,840 8,120 9,280 9,800 10,150 11,200 11,368 11,600 12,992 14,210 15,680 16,240 19,600 20,300 22,736 23,200 28,420 32,480 35,525 39,200 40,600 45,472 46,400 56,840 64,960 71,050 78,400 81,200 90,944 113,680 142,100 162,400 227,360 284,200 324,800 454,720 568,400 1,136,800 and 2,273,600, with no remainder.
Since 2,273,600 cannot be divided by just 1 and 2,273,600, it is not a prime number.