Converting Int/String to Char in Kotlin, how to understand?

Question

Kotlin

one)

var number1: Int = 5
    var number2 = number1.toChar()
    println(number2)

Result:

What does this square mean? why does it transform like that

2)

var number1: String = "A"
    var number2 = number1.toChar()
    println(number2)

Результат:  выдает ошибку

Why does it give an error? in theory should be converted to a separate character

Answer 1

The square means the character with code 5. To convert the digit 5 ​​to the character '5', `Character.forDigit(number1, 10)`
In the second example, the string must not be converted to a single character. Why? And if the string does not consist of one character, then what was this method supposed to do?