# List of prime numbers before 81

## Prime Numbers Before Calculator

Enter a natural number to calculate the primes before it:
Ex.: 4, 11, 64, 128, ... until 10,000.

#### Prime Numbers Before 81:

The number 81 is not a prime number because it is possible to express it as a product of prime factors. In other words, 81 can be divided by 1, by itself and at least by 3. So, 81 is a 'composite number'.

List of prime numbers before 81:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79.

Here you'll find the answer to questions like: List of prime numbers before 81. Get all the prime numbers from one to 81. Use the Prime Numbers Before Calculator below to discover if any given number is prime or composite and get all the primes up to 81.

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