A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2601300 can be evenly divided by 1 2 3 4 5 6 10 12 13 15 20 23 25 26 29 30 39 46 50 52 58 60 65 69 75 78 87 92 100 115 116 130 138 145 150 156 174 195 230 260 276 290 299 300 325 345 348 377 390 435 460 575 580 598 650 667 690 725 754 780 870 897 975 1,131 1,150 1,196 1,300 1,334 1,380 1,450 1,495 1,508 1,725 1,740 1,794 1,885 1,950 2,001 2,175 2,262 2,300 2,668 2,900 2,990 3,335 3,450 3,588 3,770 3,900 4,002 4,350 4,485 4,524 5,655 5,980 6,670 6,900 7,475 7,540 8,004 8,671 8,700 8,970 9,425 10,005 11,310 13,340 14,950 16,675 17,342 17,940 18,850 20,010 22,425 22,620 26,013 28,275 29,900 33,350 34,684 37,700 40,020 43,355 44,850 50,025 52,026 56,550 66,700 86,710 89,700 100,050 104,052 113,100 130,065 173,420 200,100 216,775 260,130 433,550 520,260 650,325 867,100 1,300,650 and 2,601,300, with no remainder.
Since 2,601,300 cannot be divided by just 1 and 2,601,300, it is not a prime number.