Is 20521 a prime number?

20 521 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 20 521 is about 143.252.

Thus, the square root of 20 521 is not an integer, and therefore 20 521 is not a square number.

Anyway, 20 521 is a prime number, and a prime number cannot be a perfect square.

The square of a number (here 20 521) is the result of the product of this number (20 521) by itself (i.e., 20 521 × 20 521); the square of 20 521 is sometimes called "raising 20 521 to the power 2", or "20 521 squared".

The square of 20 521 is 421 111 441 because 20 521 × 20 521 = 20 521² = 421 111 441.

As a consequence, 20 521 is the square root of 421 111 441.

20 521 is a number with 5 digits.

The multiples of 20 521 are all integers evenly divisible by 20 521, that is all numbers such that the remainder of the division by 20 521 is zero. There are infinitely many multiples of 20 521. The smallest multiples of 20 521 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 20 521 too, since 0 × 20 521 = 0
• 20 521: indeed, 20 521 is a multiple of itself, since 20 521 is evenly divisible by 20 521 (we have 20 521 / 20 521 = 1, so the remainder of this division is indeed zero)
• 41 042: indeed, 41 042 = 20 521 × 2
• 61 563: indeed, 61 563 = 20 521 × 3
• 82 084: indeed, 82 084 = 20 521 × 4
• 102 605: indeed, 102 605 = 20 521 × 5
• etc.

• Preceding numbers: …20 519, 20 520
• Following numbers: 20 522, 20 523…

Nearest numbers from 20 521

• Preceding prime number: 20 509
• Following prime number: 20 533

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• Five thousand prime numbers

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• 20 521 est-il un nombre premier ?