A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2602080 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 16 18 20 24 26 30 32 36 39 40 45 48 52 60 65 72 78 80 90 96 104 117 120 130 139 144 156 160 180 195 208 234 240 260 278 288 312 360 390 416 417 468 480 520 556 585 624 695 720 780 834 936 1,040 1,112 1,170 1,248 1,251 1,390 1,440 1,560 1,668 1,807 1,872 2,080 2,085 2,224 2,340 2,502 2,780 3,120 3,336 3,614 3,744 4,170 4,448 4,680 5,004 5,421 5,560 6,240 6,255 6,672 7,228 8,340 9,035 9,360 10,008 10,842 11,120 12,510 13,344 14,456 16,263 16,680 18,070 18,720 20,016 21,684 22,240 25,020 27,105 28,912 32,526 33,360 36,140 40,032 43,368 50,040 54,210 57,824 65,052 66,720 72,280 81,315 86,736 100,080 108,420 130,104 144,560 162,630 173,472 200,160 216,840 260,208 289,120 325,260 433,680 520,416 650,520 867,360 1,301,040 and 2,602,080, with no remainder.
Since 2,602,080 cannot be divided by just 1 and 2,602,080, it is not a prime number.