A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2360280 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 17 20 24 26 30 34 39 40 51 52 60 65 68 78 85 89 102 104 120 130 136 156 170 178 195 204 221 255 260 267 312 340 356 390 408 442 445 510 520 534 663 680 712 780 884 890 1,020 1,068 1,105 1,157 1,326 1,335 1,513 1,560 1,768 1,780 2,040 2,136 2,210 2,314 2,652 2,670 3,026 3,315 3,471 3,560 4,420 4,539 4,628 5,304 5,340 5,785 6,052 6,630 6,942 7,565 8,840 9,078 9,256 10,680 11,570 12,104 13,260 13,884 15,130 17,355 18,156 19,669 22,695 23,140 26,520 27,768 30,260 34,710 36,312 39,338 45,390 46,280 59,007 60,520 69,420 78,676 90,780 98,345 118,014 138,840 157,352 181,560 196,690 236,028 295,035 393,380 472,056 590,070 786,760 1,180,140 and 2,360,280, with no remainder.
Since 2,360,280 cannot be divided by just 1 and 2,360,280, it is not a prime number.