Prime, GCD & LCM Calculator

Prime factorisation, primality test, GCD and LCM of numbers

Prime, GCD & LCM Calculator is a free online browser-based utility designed to prime factorisation, primality test, gcd and lcm of numbers. All computations, processing, and rendering happen completely inside your browser client, ensuring your data is kept secure and private.

How to use Prime, GCD & LCM Calculator

  1. Enter Inputs. Input your data, values, or upload your file into the provided container panel.
  2. Configure Options. Adjust sliders, selectors, or toggles to customize your desired output parameters.
  3. Verify Live Preview. Review the instant calculation or visual representation generated in real-time.
  4. Export Result. Click the Copy or Download button to save your formatted output.

Features

  • Clean Interface: Streamlined layout designed for maximum focus and efficiency.
  • One-Click Copy/Download: Easily export results to your clipboard or local files.
  • Offline Ready: Works without an internet connection once loaded in your browser.

Why use this tool

  • 100% Privacy: All processing happens locally in your browser. No files or inputs are sent to any servers.
  • Lightning Fast: Instant client-side calculations with zero network latency or server load times.
  • Mobile Responsive: Designed to work flawlessly on smartphones, tablets, and desktop browsers.

Frequently asked questions

How do I find the prime factors of a number?

Divide the number by the smallest prime that fits, repeat with the quotient, and continue until you reach 1. Enter 360 and the tool shows 360 = 2 cubed x 3 squared x 5. It also tells you whether the number is prime and how many divisors it has.

How do I check whether a number is prime?

A prime has exactly two divisors: 1 and itself. Enter the number and the "Is it prime?" box shows Yes or No; a prime factorisation with a single prime raised to the power 1 means it is prime. For example, 97 is prime and 91 (7 x 13) is not.

How do I find the GCD (HCF) of numbers?

The greatest common divisor is the largest number that divides all of them, found with the Euclidean algorithm. For 48, 180 and 36 the GCD is 12. Enter two or more positive whole numbers, separated by commas or spaces, in the GCD and LCM card.

How do I find the LCM of numbers?

The LCM is the smallest number that all of them divide into. For two numbers it is a x b / GCD. For 48, 180 and 36 the LCM is 720. If the result is too large to be exact, the tool shows Too large.

How is the number of divisors calculated?

Add 1 to each prime exponent and multiply the results. Since 360 = 2^3 x 3^2 x 5^1, divisors = (3 + 1)(2 + 1)(1 + 1) = 24. The tool shows this count for the number you factorise.

How large a number can the prime factorisation tool handle?

It works on whole numbers from 2 up to 9,007,199,254,740,991 (2^53 - 1), the largest integer a browser can represent exactly. Numbers with very large prime factors can take a little longer to factorise. Decimals, negatives and 0 or 1 are not accepted.

Is my data shared when using the Prime, GCD & LCM Calculator?

No. Toolskyt operates under a zero-server policy. All calculations, data formatting, and file exports are executed locally on your machine.

Do I need to sign up or pay to use the Prime, GCD & LCM Calculator?

No, this tool is 100% free. There are no limits, sign-ups, subscriptions, or hidden charges required.

Related tools