How do I get the simplified sq root of 45?

√45
= √(3² × 5)
= √(3²) × √5
= 3√5

√[9*5] = 3√5

√45
= 3√5

What is one of the values that is a dividend of 45? That is also a square. What two values (one is a square, one is not) that when multiplied make 45? Then take the square root of one and the value of the other to get the simplified value.