A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2031300 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 25 30 36 37 45 50 60 61 74 75 90 100 111 122 148 150 180 183 185 222 225 244 300 305 333 366 370 444 450 549 555 610 666 732 740 900 915 925 1,098 1,110 1,220 1,332 1,525 1,665 1,830 1,850 2,196 2,220 2,257 2,745 2,775 3,050 3,330 3,660 3,700 4,514 4,575 5,490 5,550 6,100 6,660 6,771 8,325 9,028 9,150 10,980 11,100 11,285 13,542 13,725 16,650 18,300 20,313 22,570 27,084 27,450 33,300 33,855 40,626 45,140 54,900 56,425 67,710 81,252 101,565 112,850 135,420 169,275 203,130 225,700 338,550 406,260 507,825 677,100 1,015,650 and 2,031,300, with no remainder.
Since 2,031,300 cannot be divided by just 1 and 2,031,300, it is not a prime number.