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**Hint:**In order to find the square of any number we just need to multiply the given number by itself once to get the desired answer.

\[{a^2} = a \times a\] where a is a real number.

**Complete step-by-step answer:**

Here the given number is 31.

Let \[x = 31\]

Now as we know that in order to find the square of any number we just need to multiply the given number by itself once.

Therefore we have to multiply x by itself once to get its square.

Hence on multiplying we get:-

\[{x^2} = x \times x\]

Now putting in the value of x we get:-

\[{\left( {31} \right)^2} = 31 \times 31\]

Evaluating the right hand side further we get:-

\[ \Rightarrow {\left( {31} \right)^2} = 961\]

Hence the square of 31 is 961.

**Note:**Students should take a note that they can find the square of any real number.

Also they have to multiply the number by itself only once in order to get its square.

When a number in square root is multiplied by itself then it gives the number under the square root as the result.

\[

{\left( {\sqrt a } \right)^2} = \sqrt a \times \sqrt a \\

{\text{ }} = a \\

\]

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