Q: Is 638,620 a Prime Number?
A: No, 638,620 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 638620 can be evenly divided by 1 2 4 5 10 20 37 74 148 185 370 740 863 1,726 3,452 4,315 8,630 17,260 31,931 63,862 127,724 159,655 319,310 and 638,620, with no remainder.
Since 638,620 cannot be divided by just 1 and 638,620, it is not a prime number.