Q: Is 638,340 a Prime Number?
A: No, 638,340 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 638340 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 30 60 10,639 21,278 31,917 42,556 53,195 63,834 106,390 127,668 159,585 212,780 319,170 and 638,340, with no remainder.
Since 638,340 cannot be divided by just 1 and 638,340, it is not a prime number.