when you put the number and the square root in the calculator, always at the same time, you should either get a number with a bunch of numbers after the decimal point or not very many. for example, a rational number could be = 3 where as the numbers could be multiplied (3x3=9). and a irrational number is like = 2.2360679775, so they cannot be multiplied to get 5. hope this helps!
