Is 820221 a prime number?

820 221 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 820 221 is about 905.661.

Thus, the square root of 820 221 is not an integer, and therefore 820 221 is not a square number.

The square of a number (here 820 221) is the result of the product of this number (820 221) by itself (i.e., 820 221 × 820 221); the square of 820 221 is sometimes called "raising 820 221 to the power 2", or "820 221 squared".

The square of 820 221 is 672 762 488 841 because 820 221 × 820 221 = 820 221² = 672 762 488 841.

As a consequence, 820 221 is the square root of 672 762 488 841.

820 221 is a number with 6 digits.

The multiples of 820 221 are all integers evenly divisible by 820 221, that is all numbers such that the remainder of the division by 820 221 is zero. There are infinitely many multiples of 820 221. The smallest multiples of 820 221 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 820 221 too, since 0 × 820 221 = 0
• 820 221: indeed, 820 221 is a multiple of itself, since 820 221 is evenly divisible by 820 221 (we have 820 221 / 820 221 = 1, so the remainder of this division is indeed zero)
• 1 640 442: indeed, 1 640 442 = 820 221 × 2
• 2 460 663: indeed, 2 460 663 = 820 221 × 3
• 3 280 884: indeed, 3 280 884 = 820 221 × 4
• 4 101 105: indeed, 4 101 105 = 820 221 × 5
• etc.

• Preceding numbers: …820 219, 820 220
• Following numbers: 820 222, 820 223…

Nearest numbers from 820 221

• Preceding prime number: 820 213
• Following prime number: 820 223

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• 820 221 est-il un nombre premier ?