Hi! Possible solution can be like so:

enum RootError: Error {
    case outOfBounds, noRoot
}

func squareRoot(_ number: Int) throws -> String {
    // if number is out of bounds throw error
    if number > 10_000 || number < 1 {
        throw RootError.outOfBounds
    }

    // let's set the root as zero and find out the root of our number by looping through possible multiplication results
    var root = 0
    for i in 1...100 {
        if i * i == number {
            root = i
        }
    }

    // if root is still zero, meaning i * i never == number then throw error
    if root == 0 {
        throw RootError.noRoot
    }
    // return your result
    return "This is the square root: \(root)"
}

let test = 16
do {
    let result = try squareRoot(test)
    print(result)
} catch let error {
    print(error)
}