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import Darwin

func isPrime(n: Double) -> Bool {
    
    if n < 2 {
        return false
    }
    
    if n == 2 {
        return true
    }
    
    if n % 2 == 0 {
        return false
    }
    
    for var i: Double = 3; i <= sqrt(n); i += 2 {
    
        if n % i == 0 {
            return false
        }
        
    }
    
    return true
    
}