Is 21521 a prime number?

21 521 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 21 521 is about 146.700.

Thus, the square root of 21 521 is not an integer, and therefore 21 521 is not a square number.

Anyway, 21 521 is a prime number, and a prime number cannot be a perfect square.

The square of a number (here 21 521) is the result of the product of this number (21 521) by itself (i.e., 21 521 × 21 521); the square of 21 521 is sometimes called "raising 21 521 to the power 2", or "21 521 squared".

The square of 21 521 is 463 153 441 because 21 521 × 21 521 = 21 521² = 463 153 441.

As a consequence, 21 521 is the square root of 463 153 441.

21 521 is a number with 5 digits.

The multiples of 21 521 are all integers evenly divisible by 21 521, that is all numbers such that the remainder of the division by 21 521 is zero. There are infinitely many multiples of 21 521. The smallest multiples of 21 521 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 21 521 too, since 0 × 21 521 = 0
• 21 521: indeed, 21 521 is a multiple of itself, since 21 521 is evenly divisible by 21 521 (we have 21 521 / 21 521 = 1, so the remainder of this division is indeed zero)
• 43 042: indeed, 43 042 = 21 521 × 2
• 64 563: indeed, 64 563 = 21 521 × 3
• 86 084: indeed, 86 084 = 21 521 × 4
• 107 605: indeed, 107 605 = 21 521 × 5
• etc.

• Preceding numbers: …21 519, 21 520
• Following numbers: 21 522, 21 523…

Nearest numbers from 21 521

• Preceding prime number: 21 517
• Following prime number: 21 523

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• 21 521 est-il un nombre premier ?