Prime Number Program in Java

Prime Number Program in Java  & What is Prime Number

• What is Prime Number
• Find Single Prime Number In Java Program
• Find prime numbers from 1 to 100 and 1 to n

What is a Prime Number? A prime number is a number that is only divisible by 1 or itself. For example, 11 is only divisible by 1 or itself. Other Prime numbers 2, 3, 5, 7, 11, 13, 17.... Note: 0 and 1 are not prime numbers. 2 is the only even prime number. A whole number greater than 1 that can not be made by multiplying other whole numbers.  

Find Single Prime Number In Java Program

package hpkingdom.com;

public class PrimeNumber {

public static void main(String[] args) {
int num=2;
int sum=0;
for (int i=2; i<=num; i++)
{
if (num%i==0)
{
sum=sum+1;
}
}
if (sum!=1)
{
System.out.println(num + " : is a Not Prime Number" );
}
else
{
System.out.println(num + " : is a Prime Number" );
}
}
}

 

Output:

[wpdiscuz-feedback id="cbvdln6lrt" question="Please leave a feedback on this" opened="1"]2 : is a Prime Number[/wpdiscuz-feedback]

   

Java program to display prime numbers from 1 to 100 and 1 to n

package hpkingdom.com;

public class PrimeNumber {

public static void main(String[] args) {

for (int num=2; num<=100; num++){

int sum=0;
for (int i=2; i<=num; i++)
{
if (num%i==0)
{
sum=sum+1;
}
}
if (sum!=1)
{
System.out.println(num + " : is a Not Prime Number" );
}
else
{
System.out.println(num + " : is a Prime Number" );
}
}
}
}

 

Output:

2 : is a Prime Number 3 : is a Prime Number 4 : is a Not Prime Number 5 : is a Prime Number 6 : is a Not Prime Number 7 : is a Prime Number 8 : is a Not Prime Number 9 : is a Not Prime Number 10 : is a Not Prime Number 11 : is a Prime Number 12 : is a Not Prime Number 13 : is a Prime Number 14 : is a Not Prime Number 15 : is a Not Prime Number 16 : is a Not Prime Number 17 : is a Prime Number 18 : is a Not Prime Number 19 : is a Prime Number 20 : is a Not Prime Number 21 : is a Not Prime Number 22 : is a Not Prime Number 23 : is a Prime Number 24 : is a Not Prime Number 25 : is a Not Prime Number 26 : is a Not Prime Number 27 : is a Not Prime Number 28 : is a Not Prime Number 29 : is a Prime Number 30 : is a Not Prime Number 31 : is a Prime Number 32 : is a Not Prime Number 33 : is a Not Prime Number 34 : is a Not Prime Number 35 : is a Not Prime Number 36 : is a Not Prime Number 37 : is a Prime Number 38 : is a Not Prime Number 39 : is a Not Prime Number 40 : is a Not Prime Number 41 : is a Prime Number 42 : is a Not Prime Number 43 : is a Prime Number 44 : is a Not Prime Number 45 : is a Not Prime Number 46 : is a Not Prime Number 47 : is a Prime Number 48 : is a Not Prime Number 49 : is a Not Prime Number 50 : is a Not Prime Number 51 : is a Not Prime Number 52 : is a Not Prime Number 53 : is a Prime Number 54 : is a Not Prime Number 55 : is a Not Prime Number 56 : is a Not Prime Number 57 : is a Not Prime Number 58 : is a Not Prime Number 59 : is a Prime Number 60 : is a Not Prime Number 61 : is a Prime Number 62 : is a Not Prime Number 63 : is a Not Prime Number 64 : is a Not Prime Number 65 : is a Not Prime Number 66 : is a Not Prime Number 67 : is a Prime Number 68 : is a Not Prime Number 69 : is a Not Prime Number 70 : is a Not Prime Number 71 : is a Prime Number 72 : is a Not Prime Number 73 : is a Prime Number 74 : is a Not Prime Number 75 : is a Not Prime Number 76 : is a Not Prime Number 77 : is a Not Prime Number 78 : is a Not Prime Number 79 : is a Prime Number 80 : is a Not Prime Number 81 : is a Not Prime Number 82 : is a Not Prime Number 83 : is a Prime Number 84 : is a Not Prime Number 85 : is a Not Prime Number 86 : is a Not Prime Number 87 : is a Not Prime Number 88 : is a Not Prime Number 89 : is a Prime Number 90 : is a Not Prime Number 91 : is a Not Prime Number 92 : is a Not Prime Number 93 : is a Not Prime Number 94 : is a Not Prime Number 95 : is a Not Prime Number 96 : is a Not Prime Number 97 : is a Prime Number 98 : is a Not Prime Number 99 : is a Not Prime Number 100 : is a Not Prime Number