Square of 81: 81² = 6,561

As we have calculated further down on this page, the square root of 81 is a whole number. 81 is a perfect square.

The principal square root is the positive number square root. Unless otherwise stated, “the square root” of a number refers ONLY to the principal square root. The square root of n2 is the absolute value of n. When solving a simple equation such as x2 = 25, it must be observed that there are two solutions.

Informally: When you multiply an integer (a “whole” number, positive, negative or zero) times itself, the resulting product is called a square number, or a perfect square or simply “a square.” So, 0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, and so on, are all square numbers.

the perfect square is 81 because 9*9 is 81 . This answer has been confirmed as correct and helpful.

According to a Google search: “The perfect squares are the squares of the whole numbers: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100 … The square root of a number, n, written. is the number that gives n when multiplied by itself. For example, because 10 x 10 = 100.”

Perfect square is a obtained when a number is multiplied to itself. that is , then , y² is a perfect square. For 49, we can write 49 as , Thus, 49 is a perfect square.

36, 16, 81, and 64 are all of your perfect squares.

A perfect square is a number made by squaring a whole number. therefore, numbers 2, 18, 32, 44, 94 are not perfect squares. Answer: 1, 16, 100.

• Answer:
• The only correct answer is:
• All positive numbers have two square roots.
• Step-by-step explanation:
• This is true because in any situation all positive numbers have two square roots.
• The others such as 18 = 9, 149 = 7, and 25 = 5 are all false statements.

List of Perfect Squares

The square root of a positive number is always less than half of the number itself. The square root of a positive number less than 1 is less than the number. The square root of a perfect square is not a whole number. The square root of a positive number less than 1 is between 0 and 1.

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