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Golang program to check the given number is Prime or not using the for loop

Here, we are going to learn how to check the given number is Prime or not using the for loop in Golang (Go Language)?
Submitted by Nidhi, on March 06, 2021 [Last updated : March 03, 2023]

Checking Prime Number in Golang

Problem Solution:

In this program, we will read an integer number and check entered number is Prime or not using the for loop.

Prime Number: A prime number is a number that is divisible by 1 and itself. Number 2 is the first PRIME number.

Program/Source Code:

The source code to check the given number is PRIME or not using the for loop is given below. The given program is compiled and executed successfully.

Golang code to check the given number is Prime or not using the for loop

// Golang program to check the given number is PRIME or not
// using the "for" loop.

package main

import "fmt"

func main() {
	var num int = 0
	var flag int = 0

	fmt.Print("Enter Number: ")
	fmt.Scanf("%d", &num)

	for count := 2; count < num/2; count++ {
		if num%count == 0 {
			flag = 1
			break
		}
	}
	if flag == 1 {
		fmt.Print("Given number is not PRIME number")
	} else {
		fmt.Print("Given number is PRIME number")
	}
}

Output:

RUN 1:
Enter Number: 17
Given number is PRIME number

RUN 2:
Enter Number: 123
Given number is not PRIME number

Explanation:

In the above program, we declare the package main. The main package is used to tell the Go language compiler that the package must be compiled and produced the executable file. Here, we imported the fmt package that includes the files of package fmt then we can use a function related to the fmt package.

In the main() function, we created two variables num, flag that are initialized with 0. Here, we checked entered a number is a prime number or not using the for loop and then print the appropriate message on the console screen.

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