A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2767380 can be evenly divided by 1 2 3 4 5 6 7 10 11 12 14 15 20 21 22 28 30 33 35 42 44 55 60 66 70 77 84 105 110 132 140 154 165 210 220 231 308 330 385 420 462 599 660 770 924 1,155 1,198 1,540 1,797 2,310 2,396 2,995 3,594 4,193 4,620 5,990 6,589 7,188 8,386 8,985 11,980 12,579 13,178 16,772 17,970 19,767 20,965 25,158 26,356 32,945 35,940 39,534 41,930 46,123 50,316 62,895 65,890 79,068 83,860 92,246 98,835 125,790 131,780 138,369 184,492 197,670 230,615 251,580 276,738 395,340 461,230 553,476 691,845 922,460 1,383,690 and 2,767,380, with no remainder.
Since 2,767,380 cannot be divided by just 1 and 2,767,380, it is not a prime number.