Q: Is 635,420 a Prime Number?
A: No, 635,420 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 635420 can be evenly divided by 1 2 4 5 10 20 31,771 63,542 127,084 158,855 317,710 and 635,420, with no remainder.
Since 635,420 cannot be divided by just 1 and 635,420, it is not a prime number.