A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2533300 can be evenly divided by 1 2 4 5 7 10 11 14 20 22 25 28 35 44 47 49 50 55 70 77 94 98 100 110 140 154 175 188 196 220 235 245 275 308 329 350 385 470 490 517 539 550 658 700 770 940 980 1,034 1,078 1,100 1,175 1,225 1,316 1,540 1,645 1,925 2,068 2,156 2,303 2,350 2,450 2,585 2,695 3,290 3,619 3,850 4,606 4,700 4,900 5,170 5,390 6,580 7,238 7,700 8,225 9,212 10,340 10,780 11,515 12,925 13,475 14,476 16,450 18,095 23,030 25,333 25,850 26,950 32,900 36,190 46,060 50,666 51,700 53,900 57,575 72,380 90,475 101,332 115,150 126,665 180,950 230,300 253,330 361,900 506,660 633,325 1,266,650 and 2,533,300, with no remainder.
Since 2,533,300 cannot be divided by just 1 and 2,533,300, it is not a prime number.