Prime Number Calculator

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Table of Contents

1

What is Prime Number?

A prime is a whole number greater than one with exactly two positive divisors.

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How to Use This Calculator

  1. Enter or select Number.
  2. Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
  3. Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used

Test divisors from 2 through floor(√n)
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Variables Explained

InputWhat it means
NumberThe number to test or transform; use the integer or real-number domain stated in the formula.
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Worked Example

29 has no divisor among 2, 3, 4 and 5, so it is prime.

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Why Use This Calculator?

Check whether an integer has a nontrivial factor before using it in a number-theory exercise.

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Common Mistakes

    • One is neither prime nor composite; negative integers are outside this usual definition.
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Frequently Asked Questions

Should I round numbers before calculating?

Keep the original input precision through the calculation and round the final answer to the precision you need. Rounding an intermediate result can change later steps.

Why can a manual calculation differ slightly?

Check the operation, units, signs and rounding first. Equivalent fractions or expressions can look different while representing the same value.

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Sources & References

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