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Tip: How to Check Whether a Number Is Prime

Learn how to check if a number is prime using the isProbablePrime method in Java.


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Java has an API called BigInteger and it is easily able to identify if the number under consideration is a prime number or not.

Code snippet:

import java.math.BigInteger;

public class ProbablePrime
{
    public static void main(String[] args) 
   {
      ProbablePrime probablePrime = new ProbablePrime();
      int numberArg = Integer.parseInt(args[0]);
      probablePrime.proceed(numberArg);
   }
   
   private void proceed(int numberArg)
   {
      //numberArg is the number under consideration. The argument 1 for isProbablePrime method is the certainty
      System.out.println(BigInteger.valueOf(numberArg).isProbablePrime(1));
      
   }
}

/*

Expected output:

[root@mypc]# java ProbablePrime 79
true

[root@mypc]# java ProbablePrime 80
false

*/

 

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Sridhar M S. is a Java developer from Bangalore, India. He holds a master's degree in Computer Science.
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