Is 11821 a prime number?

11 821 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 11 821 is about 108.724.

Thus, the square root of 11 821 is not an integer, and therefore 11 821 is not a square number.

Anyway, 11 821 is a prime number, and a prime number cannot be a perfect square.

The square of a number (here 11 821) is the result of the product of this number (11 821) by itself (i.e., 11 821 × 11 821); the square of 11 821 is sometimes called "raising 11 821 to the power 2", or "11 821 squared".

The square of 11 821 is 139 736 041 because 11 821 × 11 821 = 11 821² = 139 736 041.

As a consequence, 11 821 is the square root of 139 736 041.

11 821 is a number with 5 digits.

The multiples of 11 821 are all integers evenly divisible by 11 821, that is all numbers such that the remainder of the division by 11 821 is zero. There are infinitely many multiples of 11 821. The smallest multiples of 11 821 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 11 821 too, since 0 × 11 821 = 0
• 11 821: indeed, 11 821 is a multiple of itself, since 11 821 is evenly divisible by 11 821 (we have 11 821 / 11 821 = 1, so the remainder of this division is indeed zero)
• 23 642: indeed, 23 642 = 11 821 × 2
• 35 463: indeed, 35 463 = 11 821 × 3
• 47 284: indeed, 47 284 = 11 821 × 4
• 59 105: indeed, 59 105 = 11 821 × 5
• etc.

• Preceding numbers: …11 819, 11 820
• Following numbers: 11 822, 11 823…

Nearest numbers from 11 821

• Preceding prime number: 11 813
• Following prime number: 11 827

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• 11 821 est-il un nombre premier ?