Q: Is 1,778,500 a Prime Number?
A: No, 1,778,500 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 1778500 can be evenly divided by 1 2 4 5 10 20 25 50 100 125 250 500 3,557 7,114 14,228 17,785 35,570 71,140 88,925 177,850 355,700 444,625 889,250 and 1,778,500, with no remainder.
Since 1,778,500 cannot be divided by just 1 and 1,778,500, it is not a prime number.