Q: Is 621,005 a Prime Number?
A: No, 621,005 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 621005 can be evenly divided by 1 5 7 11 35 55 77 385 1,613 8,065 11,291 17,743 56,455 88,715 124,201 and 621,005, with no remainder.
Since 621,005 cannot be divided by just 1 and 621,005, it is not a prime number.