A Natural Number is called Prime Number
if it has exactly two positive divisors, the number one (1) and the number itself.
Prime numbers starts at the number two (2) and continue to infinity.
Example: 2, 3, 5, 7, 11, 13, 17, 19, 23, ... infinity.

Notice numbers 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, ... are not shown
because they are Composite Numbers. To see what
numbers between 1 and 1000, use he prime number calculator.

Please read! To use this calculator is easy. Enter any number 1 to 1000,
and the calculator will determine if it is a prime number.

Prime Numbers Calculator

Enter The Number Here Then Press The SUBMIT Button