Think of the times table.

Try to recall the square root of 9 with both the signs.

Try to recall the formula for area of square.

Think of the number whose square will give you 3600.

Use the prime factorization method for this number.

Think of a number that multipliedÂ by itselfÂ gives 25.

Look at the units place and try to find the number.

Think of the number which givesÂ 5 at the end of square and since there are 2 zeros so how many zeros should there in it's square root.

Use the prime factorization method for this.

Recall how to find perfect square by using ones digit.