A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 713400 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 20 24 25 29 30 40 41 50 58 60 75 82 87 100 116 120 123 145 150 164 174 200 205 232 246 290 300 328 348 410 435 492 580 600 615 696 725 820 870 984 1,025 1,160 1,189 1,230 1,450 1,640 1,740 2,050 2,175 2,378 2,460 2,900 3,075 3,480 3,567 4,100 4,350 4,756 4,920 5,800 5,945 6,150 7,134 8,200 8,700 9,512 11,890 12,300 14,268 17,400 17,835 23,780 24,600 28,536 29,725 35,670 47,560 59,450 71,340 89,175 118,900 142,680 178,350 237,800 356,700 and 713,400, with no remainder.
Since 713,400 cannot be divided by just 1 and 713,400, it is not a prime number.