There are 47 students in the third grade participating in the gymnastics performance. If they want to stand in a square team, at least how many more people must be added.
三年级有47名学生参加体操表演，如果要站成方队，至少要增加多少人．
<gadget id="calculator">49 - 47</gadget>
<output>2</output>

<result>2</result>