Is it a prime number? Swift

Swift-isItAPrimeNumber.txt

func isNumberDivisible(_ number: Int, by divisor: Int) -> Bool {
    if number % divisor == 0 {
        return true
    } else {
        return false
    }
}




func isPrime(_ number: Int) -> Bool {
    var listOfDivisbleNumbers = [Int()]
    
    for i in 1...number{
        if isNumberDivisible(number, by: i) == true {
            listOfDivisbleNumbers.append(i)
            
        }
}
    if listOfDivisbleNumbers.count == 3 {
        return true
    }else{
        return false
    }
}