A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2035500 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 23 25 30 46 50 59 60 69 75 92 100 115 118 125 138 150 177 230 236 250 276 295 300 345 354 375 460 500 575 590 690 708 750 885 1,150 1,180 1,357 1,380 1,475 1,500 1,725 1,770 2,300 2,714 2,875 2,950 3,450 3,540 4,071 4,425 5,428 5,750 5,900 6,785 6,900 7,375 8,142 8,625 8,850 11,500 13,570 14,750 16,284 17,250 17,700 20,355 22,125 27,140 29,500 33,925 34,500 40,710 44,250 67,850 81,420 88,500 101,775 135,700 169,625 203,550 339,250 407,100 508,875 678,500 1,017,750 and 2,035,500, with no remainder.
Since 2,035,500 cannot be divided by just 1 and 2,035,500, it is not a prime number.