Is 18021 a prime number?

18 021 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 18 021 is about 134.242.

Thus, the square root of 18 021 is not an integer, and therefore 18 021 is not a square number.

The square of a number (here 18 021) is the result of the product of this number (18 021) by itself (i.e., 18 021 × 18 021); the square of 18 021 is sometimes called "raising 18 021 to the power 2", or "18 021 squared".

The square of 18 021 is 324 756 441 because 18 021 × 18 021 = 18 021² = 324 756 441.

As a consequence, 18 021 is the square root of 324 756 441.

18 021 is a number with 5 digits.

The multiples of 18 021 are all integers evenly divisible by 18 021, that is all numbers such that the remainder of the division by 18 021 is zero. There are infinitely many multiples of 18 021. The smallest multiples of 18 021 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 18 021 too, since 0 × 18 021 = 0
• 18 021: indeed, 18 021 is a multiple of itself, since 18 021 is evenly divisible by 18 021 (we have 18 021 / 18 021 = 1, so the remainder of this division is indeed zero)
• 36 042: indeed, 36 042 = 18 021 × 2
• 54 063: indeed, 54 063 = 18 021 × 3
• 72 084: indeed, 72 084 = 18 021 × 4
• 90 105: indeed, 90 105 = 18 021 × 5
• etc.

• Preceding numbers: …18 019, 18 020
• Following numbers: 18 022, 18 023…

Nearest numbers from 18 021

• Preceding prime number: 18 013
• Following prime number: 18 041

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• 18 021 est-il un nombre premier ?