Is 42009 a prime number?

42 009 is an odd number, because it is not evenly divisible by 2.

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• What is an even number?

A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 42 009 is about 204.961.

Thus, the square root of 42 009 is not an integer, and therefore 42 009 is not a square number.

The square of a number (here 42 009) is the result of the product of this number (42 009) by itself (i.e., 42 009 × 42 009); the square of 42 009 is sometimes called "raising 42 009 to the power 2", or "42 009 squared".

The square of 42 009 is 1 764 756 081 because 42 009 × 42 009 = 42 009² = 1 764 756 081.

As a consequence, 42 009 is the square root of 1 764 756 081.

42 009 is a number with 5 digits.

The multiples of 42 009 are all integers evenly divisible by 42 009, that is all numbers such that the remainder of the division by 42 009 is zero. There are infinitely many multiples of 42 009. The smallest multiples of 42 009 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 42 009 too, since 0 × 42 009 = 0
• 42 009: indeed, 42 009 is a multiple of itself, since 42 009 is evenly divisible by 42 009 (we have 42 009 / 42 009 = 1, so the remainder of this division is indeed zero)
• 84 018: indeed, 84 018 = 42 009 × 2
• 126 027: indeed, 126 027 = 42 009 × 3
• 168 036: indeed, 168 036 = 42 009 × 4
• 210 045: indeed, 210 045 = 42 009 × 5
• etc.

• Preceding numbers: …42 007, 42 008
• Following numbers: 42 010, 42 011…

Nearest numbers from 42 009

• Preceding prime number: 41 999
• Following prime number: 42 013

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• 42 009 est-il un nombre premier ?