Q: Is 720,380 a Prime Number?
A: No, 720,380 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 720380 can be evenly divided by 1 2 4 5 10 20 181 199 362 398 724 796 905 995 1,810 1,990 3,620 3,980 36,019 72,038 144,076 180,095 360,190 and 720,380, with no remainder.
Since 720,380 cannot be divided by just 1 and 720,380, it is not a prime number.