Kotlin- naming convention for boolean returning methods

Something about naming convention for properties in Kotlin, I know it’s not for methods. But it’s related:

From book Kotlin in Action (by Dmitry Jemerov & Svetlana Isakova) – section 2.2.1 Properties:

In Kotlin, properties are a first-class language feature, which entirely replaces fields and accessor methods.

Listing 2.5. Declaring a mutable property in a class:

class Person {
    val name: String,      // read only property: generates a field and a trivial getter
    var isMarried: Boolean // writable property: a field, getter and a setter
}

Kotlin’s name property is exposed to Java as a getter method called
getName. The getter and setter naming rule has an exception: if the
property name starts with is, no additional prefix for the getter is
added and in the setter name, is is replaced with set. Thus, from
Java, you call isMarried().