A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4034940 can be evenly divided by 1 2 3 4 5 6 7 10 12 13 14 15 20 21 26 28 30 35 39 42 52 60 65 70 78 84 91 105 130 140 156 182 195 210 260 273 364 390 420 455 546 739 780 910 1,092 1,365 1,478 1,820 2,217 2,730 2,956 3,695 4,434 5,173 5,460 7,390 8,868 9,607 10,346 11,085 14,780 15,519 19,214 20,692 22,170 25,865 28,821 31,038 38,428 44,340 48,035 51,730 57,642 62,076 67,249 77,595 96,070 103,460 115,284 134,498 144,105 155,190 192,140 201,747 268,996 288,210 310,380 336,245 403,494 576,420 672,490 806,988 1,008,735 1,344,980 2,017,470 and 4,034,940, with no remainder.
Since 4,034,940 cannot be divided by just 1 and 4,034,940, it is not a prime number.