Q: Is 431,720 a Prime Number?
A: No, 431,720 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 431720 can be evenly divided by 1 2 4 5 8 10 20 40 43 86 172 215 251 344 430 502 860 1,004 1,255 1,720 2,008 2,510 5,020 10,040 10,793 21,586 43,172 53,965 86,344 107,930 215,860 and 431,720, with no remainder.
Since 431,720 cannot be divided by just 1 and 431,720, it is not a prime number.