Answer: Radicand
Step-by-step explanation:
Hi, the number underneath the square root symbol is called the radicand.
In mathematics, a square root is represented with a radical symbol (√), and a number or expression underneath it that is called the radicand.
For example:
√9
In this expression the radicand is the number 9.
Feel free to ask for more if needed or if you did not understand something.