Q: Is 820,664 a Prime Number?
A: No, 820,664 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 820664 can be evenly divided by 1 2 4 8 13 26 52 104 169 338 607 676 1,214 1,352 2,428 4,856 7,891 15,782 31,564 63,128 102,583 205,166 410,332 and 820,664, with no remainder.
Since 820,664 cannot be divided by just 1 and 820,664, it is not a prime number.