Find the square root that is a real number. \[ \sqrt{-25} \]

Step 1 ：Given the number -25, we are asked to find the square root that is a real number.

Step 2 ：In mathematics, the square root of a negative number is not a real number. It is an imaginary number. The square root of -1 is represented by the symbol 'i'.

Step 3 ：Thus, the square root of -25 would be \(5i\). However, the question asks for a real number square root, which does not exist in this case.

Step 4 ：\(\boxed{\text{Final Answer: There is no real number square root for -25.}}\)