Q: Is 621,608 a Prime Number?
A: No, 621,608 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 621608 can be evenly divided by 1 2 4 8 13 26 43 52 86 104 139 172 278 344 556 559 1,112 1,118 1,807 2,236 3,614 4,472 5,977 7,228 11,954 14,456 23,908 47,816 77,701 155,402 310,804 and 621,608, with no remainder.
Since 621,608 cannot be divided by just 1 and 621,608, it is not a prime number.