/sci/ - Science & Math

I had stupid thought at my warehouse job. If you take random two primal numbers for example 3 and 13, multiple them 3 x 13 is 39 then imagine you have 39 2d squares. If you try to assemble them into one square or rectangle the only way to do it is with sides of length of primal numbers you chose. Of course building a rectangle with a side of length 1 is forbidden. I kinda don't know why this rule happens. It seems to be very obvious.