diff --git a/prime number b/prime number
new file mode 100644
index 0000000..5f15962
--- /dev/null
+++ b/prime number	
@@ -0,0 +1,32 @@
+// Most optimized Java program to 
+// check if a number is prime 
+import java.util.*; 
+import java.lang.*; 
+
+class prime { 
+	
+	//check for number prime or not 
+	static boolean isPrime(int n) { 
+	//check if n is a multiple of 2 
+	if (n%2==0) return false; 
+	//if not, then just check the odds 
+	for(int i=3;i<=Math.sqrt(n);i+=2) { 
+		if(n%i==0) 
+			return false; 
+	} 
+	return true; 
+} 
+	
+	// Driver Program 
+	public static void main(String[] args) 
+	{ 
+		if(isPrime(19)) 
+		System.out.println(" true") ; 
+		
+		else
+		System.out.println(" false"); 
+		
+	} 
+} 
+	
+