A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2990460 can be evenly divided by 1 2 3 4 5 6 10 11 12 15 20 22 23 30 33 44 46 55 60 66 69 92 110 115 132 138 165 197 220 230 253 276 330 345 394 460 506 591 660 690 759 788 985 1,012 1,182 1,265 1,380 1,518 1,970 2,167 2,364 2,530 2,955 3,036 3,795 3,940 4,334 4,531 5,060 5,910 6,501 7,590 8,668 9,062 10,835 11,820 13,002 13,593 15,180 18,124 21,670 22,655 26,004 27,186 32,505 43,340 45,310 49,841 54,372 65,010 67,965 90,620 99,682 130,020 135,930 149,523 199,364 249,205 271,860 299,046 498,410 598,092 747,615 996,820 1,495,230 and 2,990,460, with no remainder.
Since 2,990,460 cannot be divided by just 1 and 2,990,460, it is not a prime number.