A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6077400 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 20 21 24 25 28 30 35 40 42 50 56 60 70 75 84 100 105 120 140 150 168 175 200 210 280 300 350 420 525 600 700 840 1,050 1,400 1,447 2,100 2,894 4,200 4,341 5,788 7,235 8,682 10,129 11,576 14,470 17,364 20,258 21,705 28,940 30,387 34,728 36,175 40,516 43,410 50,645 57,880 60,774 72,350 81,032 86,820 101,290 108,525 121,548 144,700 151,935 173,640 202,580 217,050 243,096 253,225 289,400 303,870 405,160 434,100 506,450 607,740 759,675 868,200 1,012,900 1,215,480 1,519,350 2,025,800 3,038,700 and 6,077,400, with no remainder.
Since 6,077,400 cannot be divided by just 1 and 6,077,400, it is not a prime number.