A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2630160 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 16 18 20 24 26 30 36 39 40 45 48 52 60 65 72 78 80 90 104 117 120 130 144 156 180 195 208 234 240 260 281 312 360 390 468 520 562 585 624 720 780 843 936 1,040 1,124 1,170 1,405 1,560 1,686 1,872 2,248 2,340 2,529 2,810 3,120 3,372 3,653 4,215 4,496 4,680 5,058 5,620 6,744 7,306 8,430 9,360 10,116 10,959 11,240 12,645 13,488 14,612 16,860 18,265 20,232 21,918 22,480 25,290 29,224 32,877 33,720 36,530 40,464 43,836 50,580 54,795 58,448 65,754 67,440 73,060 87,672 101,160 109,590 131,508 146,120 164,385 175,344 202,320 219,180 263,016 292,240 328,770 438,360 526,032 657,540 876,720 1,315,080 and 2,630,160, with no remainder.
Since 2,630,160 cannot be divided by just 1 and 2,630,160, it is not a prime number.