A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2763000 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 25 30 36 40 45 50 60 72 75 90 100 120 125 150 180 200 225 250 300 307 360 375 450 500 600 614 750 900 921 1,000 1,125 1,228 1,500 1,535 1,800 1,842 2,250 2,456 2,763 3,000 3,070 3,684 4,500 4,605 5,526 6,140 7,368 7,675 9,000 9,210 11,052 12,280 13,815 15,350 18,420 22,104 23,025 27,630 30,700 36,840 38,375 46,050 55,260 61,400 69,075 76,750 92,100 110,520 115,125 138,150 153,500 184,200 230,250 276,300 307,000 345,375 460,500 552,600 690,750 921,000 1,381,500 and 2,763,000, with no remainder.
Since 2,763,000 cannot be divided by just 1 and 2,763,000, it is not a prime number.