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An irrational number is a number that can't be written as a simple fraction while a rational number is a number that can be written as the ratio of two integers, that is, as a simple fraction. So in this case we have the number 2 which is ration, and we can multiply it by an irrational number
such that the product is an irrational number. So any irrational number will meet our requirement because the product of any rational number and an irrational number will lead to an irrational number. For instance:

Si multiplicas 60 por 100 obtienes 6000 por lo que hay 6 mil
So i think in the school there may be 4800 in the school. Hope this helps