If a natural number 'n' is a perfect square, then its square root is a ___ number.
decimal
natural
If a natural number 'n' can be expressed as m2, where 'm' is a natural number, then 'n' is a square number.
If a number is both perfect square and perfect cube, then it will have a sixth root which is a natural number.
Prove that x2 − 6x + 9 is a perfect square for all natural numbers x. What can you say about its square root?