Is 16561 a prime number?

16 561 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 16 561 is about 128.690.

Thus, the square root of 16 561 is not an integer, and therefore 16 561 is not a square number.

Anyway, 16 561 is a prime number, and a prime number cannot be a perfect square.

The square of a number (here 16 561) is the result of the product of this number (16 561) by itself (i.e., 16 561 × 16 561); the square of 16 561 is sometimes called "raising 16 561 to the power 2", or "16 561 squared".

The square of 16 561 is 274 266 721 because 16 561 × 16 561 = 16 561² = 274 266 721.

As a consequence, 16 561 is the square root of 274 266 721.

16 561 is a number with 5 digits.

The multiples of 16 561 are all integers evenly divisible by 16 561, that is all numbers such that the remainder of the division by 16 561 is zero. There are infinitely many multiples of 16 561. The smallest multiples of 16 561 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 16 561 too, since 0 × 16 561 = 0
• 16 561: indeed, 16 561 is a multiple of itself, since 16 561 is evenly divisible by 16 561 (we have 16 561 / 16 561 = 1, so the remainder of this division is indeed zero)
• 33 122: indeed, 33 122 = 16 561 × 2
• 49 683: indeed, 49 683 = 16 561 × 3
• 66 244: indeed, 66 244 = 16 561 × 4
• 82 805: indeed, 82 805 = 16 561 × 5
• etc.

• Preceding numbers: …16 559, 16 560
• Following numbers: 16 562, 16 563…

Nearest numbers from 16 561

• Preceding prime number: 16 553
• Following prime number: 16 567

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• 16 561 est-il un nombre premier ?