![]() The isPrime variable remains true if the number is a prime number.The isPrime variable is set to false if the number is not a prime number.The isPrime variable is used to store a boolean value: either true or false.If the remainder value is evaluated to 0, that number is not a prime number.The condition number % i = 0 checks if the number is divisible by numbers other than 1 and itself. The nth prime number can be denoted as pn, so: The first prime number, p1 2. There are 1,009 total prime numbers in the lookup table below. The for loop is used to iterate through the positive numbers to check if the number entered by the user is divisible by positive numbers ( 2 to user-entered number minus 1). The prime numbers table lists the first 1000 prime numbers from 2 to 8011. Numbers greater than 1 are tested using a for loop.All negative numbers are excluded because prime numbers are positive.1 is considered neither prime nor composite.The number entered by the user is checked if it is greater than 1 using if.else if. In the above program, the user is prompted to enter a number. ![]() Example: Check Prime Number // program to check if a number is prime or notĬonst number = parseInt(prompt("Enter a positive number: ")) Ĭonsole.log("1 is neither prime nor composite number.") Ĭonsole.log(`$ is a not prime number`) Ĭonsole.log("The number is not a prime number.") For example, 2, 3, 5, 7, 11 are the first few prime numbers. A prime number is a positive integer that is only divisible by 1 and itself.
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