# Program to Print Prime Number From 1 to 100 in Java

## What is a Prime Number?

A Prime Number is a number that is only divisible by one or itself. It is a natural number greater than one that is not a product of two smaller natural numbers. For example, 11 is only divisible by one or itself. Other Prime numbers 2, 3, 5, 7, 11, 13, 17, etc.

Note: 0 and 1 are not prime numbers. 2 is the only even prime number.

## How to Print Prime Numbers Between 1 to 100 Program in Java

Below is the Java program to print prime numbers from 1 to 100:

Program Logic:

• The main method of prime number program in Java contains a loop to check prime numbers between 1 to 100 in Java one by one.
• The main method calls the method `CheckPrime` to determine whether a number is prime number in Java or not.
• We need to divide an input number, say 17 from values 2 to 17 and check the remainder. If the remainder is 0 number is not prime.
• No number is divisible by more than half of itself. So, we need to loop through just numberToCheck/2. If the input is 17, half is 8.5, and the loop will iterate through values 2 to 8
• If `numberToCheck` is entirely divisible by another number, we return false, and loop is broken.
• If `numberToCheck` is prime, we return true.
• In the main method for prime numbers 1 to 100 in Java, check isPrime is `TRUE` and add to primeNumbersFound String
• Lastly, print prime numbers from 1 to 100 in Java
```public class primeNumbersFoundber {

public static void main(String[] args) {

int i;
int num = 0;
int maxCheck = 100; // maxCheck limit till which you want to find prime numbers
boolean isPrime = true;

//Empty String

//Start loop 2 to maxCheck
for (i = 2; i <= maxCheck; i++) {
isPrime = CheckPrime(i);
if (isPrime) {
}
}
System.out.println("Prime numbers from 1 to " + maxCheck + " are:");
// Print prime numbers from 1 to maxCheck
}
public static boolean CheckPrime(int numberToCheck) {
int remainder;
for (int i = 2; i <= numberToCheck / 2; i++) {
remainder = numberToCheck % i;
//if remainder is 0 than numberToCheckber is not prime and break loop. Else continue loop
if (remainder == 0) {
return false;
}
}
return true;

}

}```

## Expected Output:

The output of the prime number between 1 to 100 in Java program will be:

```Prime numbers from 1 to 100 are:
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97```

Check our program to Find Prime Numbers from Any Input Number