Q: Is 721,400 a Prime Number?
A: No, 721,400 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 721400 can be evenly divided by 1 2 4 5 8 10 20 25 40 50 100 200 3,607 7,214 14,428 18,035 28,856 36,070 72,140 90,175 144,280 180,350 360,700 and 721,400, with no remainder.
Since 721,400 cannot be divided by just 1 and 721,400, it is not a prime number.