Q: Is 636,520 a Prime Number?
A: No, 636,520 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 636520 can be evenly divided by 1 2 4 5 8 10 20 40 15,913 31,826 63,652 79,565 127,304 159,130 318,260 and 636,520, with no remainder.
Since 636,520 cannot be divided by just 1 and 636,520, it is not a prime number.