You can put this solution on YOUR website!
Yes, lots of them. This is shown below
There is a theorem, called the fundamental theorem of arithmatic. Amongst other things it says that any whole number can be written as the product of primes. If we chose a number x, we can write it as this product of primes.
Now consider and much more interestingly .
As you can see is a square number divisible by 9. I've just realised we didn't actually need the stuff about the primes, but it's good to learn something new everyday :D
For your enjoyment, here are three really big square numbers divisible by 9 that I worked out
Hope that helps