Take the default input method of Huawei mobile phone as an example, open an interface for input, input the corresponding content, and click the symbol button. In the symbol button interface that appears, click the mathematical symbol to find the symbol of the square (small number 2), and click the numerical symbol to enter the square. The specific input method is as follows:

1. Open an interface that can edit the input content on the mobile phone (take Baidu search bar as an example).

2. Enter the numbers or related words you need in the search field.

3. Click the symbol button in the input method interface at this time.

4. In the symbol button interface that appears, drop down the page, find Math, and click Enter.

5. You can see a number 2 in the drop-down page of the mathematical symbol interface that appears. Click this number.

6. At this time, you can see that the square input of numbers has been completed in the input interface at the top of the page.