Is 1821 a prime number?

1 821 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 1 821 is about 42.673.

Thus, the square root of 1 821 is not an integer, and therefore 1 821 is not a square number.

The square of a number (here 1 821) is the result of the product of this number (1 821) by itself (i.e., 1 821 × 1 821); the square of 1 821 is sometimes called "raising 1 821 to the power 2", or "1 821 squared".

The square of 1 821 is 3 316 041 because 1 821 × 1 821 = 1 821² = 3 316 041.

As a consequence, 1 821 is the square root of 3 316 041.

1 821 is a number with 4 digits.

The multiples of 1 821 are all integers evenly divisible by 1 821, that is all numbers such that the remainder of the division by 1 821 is zero. There are infinitely many multiples of 1 821. The smallest multiples of 1 821 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 1 821 too, since 0 × 1 821 = 0
• 1 821: indeed, 1 821 is a multiple of itself, since 1 821 is evenly divisible by 1 821 (we have 1 821 / 1 821 = 1, so the remainder of this division is indeed zero)
• 3 642: indeed, 3 642 = 1 821 × 2
• 5 463: indeed, 5 463 = 1 821 × 3
• 7 284: indeed, 7 284 = 1 821 × 4
• 9 105: indeed, 9 105 = 1 821 × 5
• etc.

• Preceding numbers: …1 819, 1 820
• Following numbers: 1 822, 1 823…

Nearest numbers from 1 821

• Preceding prime number: 1 811
• Following prime number: 1 823

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• Five thousand prime numbers

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• 1 821 est-il un nombre premier ?