Q: Is 816,400 a Prime Number?
A: No, 816,400 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 816400 can be evenly divided by 1 2 4 5 8 10 13 16 20 25 26 40 50 52 65 80 100 104 130 157 200 208 260 314 325 400 520 628 650 785 1,040 1,256 1,300 1,570 2,041 2,512 2,600 3,140 3,925 4,082 5,200 6,280 7,850 8,164 10,205 12,560 15,700 16,328 20,410 31,400 32,656 40,820 51,025 62,800 81,640 102,050 163,280 204,100 408,200 and 816,400, with no remainder.
Since 816,400 cannot be divided by just 1 and 816,400, it is not a prime number.