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Created a program to check prime number #1

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Created a program to check prime number #1

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32 changes: 32 additions & 0 deletions prime number
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// 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");

}
}