Is 40 a prime number?

Here is the answer to questions like: Is 40 a prime number? or is 40 a prime or a composite number?

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Number Analysis:

The prime factorization of 40 = 23•5

The number 40 is not a prime number because it is possible to factorize it. In other words, 40 can be divided by 1, by itself and at least by 2 and 5. This is a so called 'composite number'.

Prime numbers before 40 chart

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11121314151617181920
21222324252627282930
31323334353637383940

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What is a prime number?

Definition of prime 1

An integer greater than one is called a prime number if its only positive divisors (factors) are one and itself. For example, the only divisors of 11 are 1 and 11, so 11 is a prime number, while the number 51 has divisors 3, 17 and 51 itself (51 = 3•17), making 51 not a prime number.

Definition of prime 2

A positive integer that is not divisible without remainder by any integer except itself and 1, with 1 often excluded.

Note that:

  • 0 (zero) is not a prime number because it isn't divided by itself. Zero has an infinite number of divisors (any nonzero whole number divides zero). It cannot be written as a product of two factors, neither of which is itself, so zero is also not composite. More concisely, zero is not a prime or a composite number either.
  • 1 (one) is neither a prime nor a composite number. One has only one positive divisor. It cannot be written as a product of two factors, neither of which is itself, so one is also not composite. THe number one falls in a class of numbers called units.

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