It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 216 801 009 is not a prime number.
For example, 216 801 009 can be divided by 3: 216 801 009 / 3 = 72 267 003.
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For 216 801 009 to be a prime number, it would have been required that 216 801 009 has only two divisors, i.e., itself and 1.
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216 801 009 is an odd number, because it is not evenly divisible by 2.
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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 216 801 009 is about 14 724.164.
Thus, the square root of 216 801 009 is not an integer, and therefore 216 801 009 is not a square number.
The square of a number (here 216 801 009) is the result of the product of this number (216 801 009) by itself (i.e., 216 801 009 × 216 801 009); the square of 216 801 009 is sometimes called "raising 216 801 009 to the power 2", or "216 801 009 squared".
The square of 216 801 009 is 47 002 677 503 418 080 because 216 801 009 × 216 801 009 = 216 801 0092 = 47 002 677 503 418 080.
As a consequence, 216 801 009 is the square root of 47 002 677 503 418 080.
216 801 009 is a number with 9 digits.
The multiples of 216 801 009 are all integers evenly divisible by 216 801 009, that is all numbers such that the remainder of the division by 216 801 009 is zero. There are infinitely many multiples of 216 801 009. The smallest multiples of 216 801 009 are: