Is 20021 a prime number?

20 021 is an odd number, because it is not evenly divisible by 2.

Find out more:

• 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 20 021 is about 141.496.

Thus, the square root of 20 021 is not an integer, and therefore 20 021 is not a square number.

Anyway, 20 021 is a prime number, and a prime number cannot be a perfect square.

The square of a number (here 20 021) is the result of the product of this number (20 021) by itself (i.e., 20 021 × 20 021); the square of 20 021 is sometimes called "raising 20 021 to the power 2", or "20 021 squared".

The square of 20 021 is 400 840 441 because 20 021 × 20 021 = 20 021² = 400 840 441.

As a consequence, 20 021 is the square root of 400 840 441.

20 021 is a number with 5 digits.

The multiples of 20 021 are all integers evenly divisible by 20 021, that is all numbers such that the remainder of the division by 20 021 is zero. There are infinitely many multiples of 20 021. The smallest multiples of 20 021 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 20 021 too, since 0 × 20 021 = 0
• 20 021: indeed, 20 021 is a multiple of itself, since 20 021 is evenly divisible by 20 021 (we have 20 021 / 20 021 = 1, so the remainder of this division is indeed zero)
• 40 042: indeed, 40 042 = 20 021 × 2
• 60 063: indeed, 60 063 = 20 021 × 3
• 80 084: indeed, 80 084 = 20 021 × 4
• 100 105: indeed, 100 105 = 20 021 × 5
• etc.

• Preceding numbers: …20 019, 20 020
• Following numbers: 20 022, 20 023…

Nearest numbers from 20 021

• Preceding prime number: 20 011
• Following prime number: 20 023

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• 20 021 est-il un nombre premier ?