Prime numbers in Java: A prime number is any number greater than 1 that can only be divided evenly by 1 and itself. This means that prime numbers do not have divisors other than 1 and their own value. Examples of prime numbers include 2, 3, 5, 7, 11, 13, 17, and so on.
To determine if a number is prime in Java, there isn't a specific formula, but several methods can be used. Below are some approaches to find out whether a number is prime:
import java.util.Scanner;public class PrimeNumberChecker {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.print("Enter a number to check if it's prime: ");int number = scanner.nextInt();scanner.close();if (isPrime(number)) {System.out.println(number + " is a prime number.");} else {System.out.println(number + " is not a prime number.");}}// Function to check if a number is primepublic static boolean isPrime(int num) {if (num <= 1) {return false;}for (int i = 2; i <= Math.sqrt(num); i++) {if (num % i == 0) {return false;}}return true;}}
Also Read: Data Scientist Roadmap 2025
import java.util.Scanner;public class PrimeNumber {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.print("Enter a number: ");int number = scanner.nextInt();scanner.close();boolean isPrime = true;if (number <= 1) {isPrime = false;} else {for (int i = 2; i <= Math.sqrt(number); i++) {if (number % i == 0) {isPrime = false;break;}}}if (isPrime) {System.out.println(number + " is a prime number.");} else {System.out.println(number + " is not a prime number.");}}}
import java.util.Scanner;public class PrimeNumberExample {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.print("Enter a number: ");int number = scanner.nextInt();scanner.close();boolean isPrime = true;if (number <= 1) {isPrime = false;} else {for (int i = 2; i <= number / 2; i++) {if (number % i == 0) {isPrime = false;break;}}}if (isPrime) {System.out.println(number + " is a prime number.");} else {System.out.println(number + " is not a prime number.");}}}
import java.util.Scanner;public class PrimeNumber {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.print("Enter a number: ");int number = scanner.nextInt();int i = 2;boolean isPrime = true;while (i <= number / 2) {if (number % i == 0) {isPrime = false;break;}i++;}if (isPrime && number > 1) {System.out.println(number + " is a prime number.");} else {System.out.println(number + " is not a prime number.");}scanner.close();}}
import java.util.Scanner;public class PrimeNumberChecker {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.print("Enter a number: ");int number = scanner.nextInt();scanner.close();boolean isPrime = true;if (number <= 1) {isPrime = false;} else {for (int i = 2; i <= Math.sqrt(number); i++) {if (number % i == 0) {isPrime = false;break;}}}if (isPrime) {System.out.println(number + " is a prime number.");} else {System.out.println(number + " is not a prime number.");}}}
Check if a number is divisible only by 1 and itself using if-else conditions.
There isn't a single formula, but you can use loops to check divisibility and determine prime numbers.
Use nested loops to check if the number is divisible by any other number except 1 and itself.
Iterate through numbers and use a for loop to check for prime numbers.
Use a for loop to iterate through numbers and check if each one is prime.
Use a loop to check if a number is divisible only by 1 and itself.
Use a for loop to iterate through numbers and check for primes.
Iterate from 1 to 100 using a for loop, and check each number for primality before printing it.