A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2127600 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 27 30 36 40 45 48 50 54 60 72 75 80 90 100 108 120 135 144 150 180 197 200 216 225 240 270 300 360 394 400 432 450 540 591 600 675 720 788 900 985 1,080 1,182 1,200 1,350 1,576 1,773 1,800 1,970 2,160 2,364 2,700 2,955 3,152 3,546 3,600 3,940 4,728 4,925 5,319 5,400 5,910 7,092 7,880 8,865 9,456 9,850 10,638 10,800 11,820 14,184 14,775 15,760 17,730 19,700 21,276 23,640 26,595 28,368 29,550 35,460 39,400 42,552 44,325 47,280 53,190 59,100 70,920 78,800 85,104 88,650 106,380 118,200 132,975 141,840 177,300 212,760 236,400 265,950 354,600 425,520 531,900 709,200 1,063,800 and 2,127,600, with no remainder.
Since 2,127,600 cannot be divided by just 1 and 2,127,600, it is not a prime number.