A prime number is any positive integer greater than zero that has only two proper divisorsNumber that when divided into another number leaves no remainder. , 1 and the number itself. Thus the lowest prime number is 2, which is also the only even prime; numbers greater than 1 that are not prime are known as composite numbers, because they can be expressed as the product of two other numbers smaller than themselves;[1] for instance, 8 can be expressed as . (The prime factor of 8 is )
Prime numbers are fundamental to mathematics, as all whole numbers can be constructed from them; anything that can be shown to be true about prime numbers is therefore true for all numbers.[2]
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Neale, Vicky. Closing the Gap: The Quest to Understand Prime Numbers. Ebook, Oxford University Press, 2017.
Weisstein, Eric W. “Prime Number.”
MathWorld,
http://mathworld.wolfram.com/PrimeNumber.html.