Is 221009 a prime number?

221 009 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 221 009 is about 470.116.

Thus, the square root of 221 009 is not an integer, and therefore 221 009 is not a square number.

The square of a number (here 221 009) is the result of the product of this number (221 009) by itself (i.e., 221 009 × 221 009); the square of 221 009 is sometimes called "raising 221 009 to the power 2", or "221 009 squared".

The square of 221 009 is 48 844 978 081 because 221 009 × 221 009 = 221 009² = 48 844 978 081.

As a consequence, 221 009 is the square root of 48 844 978 081.

221 009 is a number with 6 digits.

The multiples of 221 009 are all integers evenly divisible by 221 009, that is all numbers such that the remainder of the division by 221 009 is zero. There are infinitely many multiples of 221 009. The smallest multiples of 221 009 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 221 009 too, since 0 × 221 009 = 0
• 221 009: indeed, 221 009 is a multiple of itself, since 221 009 is evenly divisible by 221 009 (we have 221 009 / 221 009 = 1, so the remainder of this division is indeed zero)
• 442 018: indeed, 442 018 = 221 009 × 2
• 663 027: indeed, 663 027 = 221 009 × 3
• 884 036: indeed, 884 036 = 221 009 × 4
• 1 105 045: indeed, 1 105 045 = 221 009 × 5
• etc.

• Preceding numbers: …221 007, 221 008
• Following numbers: 221 010, 221 011…

Nearest numbers from 221 009

• Preceding prime number: 220 973
• Following prime number: 221 021

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• 221 009 est-il un nombre premier ?