A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 237600 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 25 27 30 32 33 36 40 44 45 48 50 54 55 60 66 72 75 80 88 90 96 99 100 108 110 120 132 135 144 150 160 165 176 180 198 200 216 220 225 240 264 270 275 288 297 300 330 352 360 396 400 432 440 450 480 495 528 540 550 594 600 660 675 720 792 800 825 864 880 900 990 1,056 1,080 1,100 1,188 1,200 1,320 1,350 1,440 1,485 1,584 1,650 1,760 1,800 1,980 2,160 2,200 2,376 2,400 2,475 2,640 2,700 2,970 3,168 3,300 3,600 3,960 4,320 4,400 4,752 4,950 5,280 5,400 5,940 6,600 7,200 7,425 7,920 8,800 9,504 9,900 10,800 11,880 13,200 14,850 15,840 19,800 21,600 23,760 26,400 29,700 39,600 47,520 59,400 79,200 118,800 and 237,600, with no remainder.
Since 237,600 cannot be divided by just 1 and 237,600, it is not a prime number.