*image: tigermoon.co.uk*

Shown above is a visual image of all Prime Numbers up to 1,000. In case you wonder, 168 numbers between 1 and 1,000 are Prime.

Scroll down for the Top 10 Frequently Asked Questions (and Answers!) about Primes.

Scroll further down to see related links.

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**1. What Is A Prime Number? **

A prime number is a *whole* number, or a positive integer, than can only be divided (into another whole number) by itself, and by the number 1.

**2. How Many Prime Numbers exist?**

Nobody knows for sure how many primes exist altogether.

Four (4) of the numbers between 1 and 10 are prime numbers (40%).

Twenty-five (25) numbers between 1 and 100 are prime numbers (25%).

In the numbers between 1 and 1,000, 168 of them are prime (16.8%).

Between 1 and 10,000, there are 1,229 prime numbers (12.29%).

The percentage of primes seems to decrease as the numbers get bigger.

**3. Is '1' a Prime Number? **

The number '1' is not typically considered a prime number, although it does fit the technical definition of a prime — A number than can only be divided by itself, and by the number 1. In this case, those 2 numbers are one and the same.

**4. Why are they called Prime Numbers?**

In ancient times, Prime Numbers were considered the primary basis from which all other numbers arise (through multiplication).

**5. How are Prime Numbers found? **

Prime Numbers are most often found by way of a mathematical formula called a *polynomial*.

**6. Is there a pattern to Prime Numbers?**

For centuries, mathematicians have failed to find a recognizable "pattern" for Prime Numbers.

However, there are certain facts about Primes that can help us determine more quickly whether or not a number is prime.

For example, 2 and 5 are both prime numbers. That means ALL other Primes MUST end with the digit 1, 3, 7, or 9, so that they are NOT divisible by either 2 or 5.

In 2016, two mathematicians also noticed that a prime number has a tendency to avoid repeating the same last digit as the immediately preceding prime number.

Still, for all practical purposes, mathematicians treat prime numbers as if they occur randomly.

**7. Why are Prime Numbers important? **

Primes are the basis for other numbers. In other words, EVERY number is either a prime number itself, or can be built by multiplying prime numbers together.

For instance, 84 is (2 x 2 x 3 x 7).

**8. What is the one millionth prime number?**

15,485,863.

**9. Are all prime numbers odd numbers? **

No. The number '2' is, in fact, the ONLY prime number that is even. All other even numbers can be divided evenly by 2.

**10. What is the largest known Prime Number?**

The largest known Prime Number contains 24,862,048 digits, and is too long to be typed on this page.

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