Q: Is 431,240 a Prime Number?
A: No, 431,240 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 431240 can be evenly divided by 1 2 4 5 8 10 20 40 10,781 21,562 43,124 53,905 86,248 107,810 215,620 and 431,240, with no remainder.
Since 431,240 cannot be divided by just 1 and 431,240, it is not a prime number.