Q: Is 621,628 a Prime Number?
A: No, 621,628 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 621628 can be evenly divided by 1 2 4 7 14 28 149 298 596 1,043 2,086 4,172 22,201 44,402 88,804 155,407 310,814 and 621,628, with no remainder.
Since 621,628 cannot be divided by just 1 and 621,628, it is not a prime number.