A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2967860 can be evenly divided by 1 2 4 5 7 10 14 17 20 28 29 34 35 43 58 68 70 85 86 116 119 140 145 170 172 203 215 238 290 301 340 406 430 476 493 580 595 602 731 812 860 986 1,015 1,190 1,204 1,247 1,462 1,505 1,972 2,030 2,380 2,465 2,494 2,924 3,010 3,451 3,655 4,060 4,930 4,988 5,117 6,020 6,235 6,902 7,310 8,729 9,860 10,234 12,470 13,804 14,620 17,255 17,458 20,468 21,199 24,940 25,585 34,510 34,916 42,398 43,645 51,170 69,020 84,796 87,290 102,340 105,995 148,393 174,580 211,990 296,786 423,980 593,572 741,965 1,483,930 and 2,967,860, with no remainder.
Since 2,967,860 cannot be divided by just 1 and 2,967,860, it is not a prime number.