### What is a Prime Number?

A number that's only divisible by 1 and itself is named a Prime Number. For Example, 3, 5, 7, 11 are Prime Numbers.

**Note:** 2 is the only even prime number.

### Flowchart for Prime Number:

### Algorithm for Prime Number:

Step 1: Start
Step 2: Initialize variables num,flag=1, j=2
Step 3: Read num from user
Step 4: If num<=1 // Any number less than 1 is not a prime number
Display "num is not a prime number"
Goto step 7
Step 5: Repeat the steps until j<[(n/2)+1]
5.1 If remainder of number divide j equals to 0,
Set flag=0
Goto step 6
5.2 j=j+1
Step 6: If flag==0,
Display num+" is not prime number"
Else
Display num+" n is prime number"
Step 7: Stop
Prime Number program in Python

Javascript Program to Check whether Number is Prime or Not