Is 2821 a prime number?

2 821 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 2 821 is about 53.113.

Thus, the square root of 2 821 is not an integer, and therefore 2 821 is not a square number.

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

The square of 2 821 is 7 958 041 because 2 821 × 2 821 = 2 821² = 7 958 041.

As a consequence, 2 821 is the square root of 7 958 041.

2 821 is a number with 4 digits.

The multiples of 2 821 are all integers evenly divisible by 2 821, that is all numbers such that the remainder of the division by 2 821 is zero. There are infinitely many multiples of 2 821. The smallest multiples of 2 821 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 2 821 too, since 0 × 2 821 = 0
• 2 821: indeed, 2 821 is a multiple of itself, since 2 821 is evenly divisible by 2 821 (we have 2 821 / 2 821 = 1, so the remainder of this division is indeed zero)
• 5 642: indeed, 5 642 = 2 821 × 2
• 8 463: indeed, 8 463 = 2 821 × 3
• 11 284: indeed, 11 284 = 2 821 × 4
• 14 105: indeed, 14 105 = 2 821 × 5
• etc.

• Preceding numbers: …2 819, 2 820
• Following numbers: 2 822, 2 823…

Nearest numbers from 2 821

• Preceding prime number: 2 819
• Following prime number: 2 833

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• 2 821 est-il un nombre premier ?