Q: Is 621,999 a Prime Number?
A: No, 621,999 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 621999 can be evenly divided by 1 3 7 9 21 27 63 81 189 567 1,097 3,291 7,679 9,873 23,037 29,619 69,111 88,857 207,333 and 621,999, with no remainder.
Since 621,999 cannot be divided by just 1 and 621,999, it is not a prime number.