A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 676200 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 20 21 23 24 25 28 30 35 40 42 46 49 50 56 60 69 70 75 84 92 98 100 105 115 120 138 140 147 150 161 168 175 184 196 200 210 230 245 276 280 294 300 322 345 350 392 420 460 483 490 525 552 575 588 600 644 690 700 735 805 840 920 966 980 1,050 1,127 1,150 1,176 1,225 1,288 1,380 1,400 1,470 1,610 1,725 1,932 1,960 2,100 2,254 2,300 2,415 2,450 2,760 2,940 3,220 3,381 3,450 3,675 3,864 4,025 4,200 4,508 4,600 4,830 4,900 5,635 5,880 6,440 6,762 6,900 7,350 8,050 9,016 9,660 9,800 11,270 12,075 13,524 13,800 14,700 16,100 16,905 19,320 22,540 24,150 27,048 28,175 29,400 32,200 33,810 45,080 48,300 56,350 67,620 84,525 96,600 112,700 135,240 169,050 225,400 338,100 and 676,200, with no remainder.
Since 676,200 cannot be divided by just 1 and 676,200, it is not a prime number.