It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 213 509 009 is not a prime number.
For example, 213 509 009 can be divided by 7: 213 509 009 / 7 = 30 501 287.
For 213 509 009 to be a prime number, it would have been required that 213 509 009 has only two divisors, i.e., itself and 1.
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213 509 009 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 213 509 009 is about 14 611.947.
Thus, the square root of 213 509 009 is not an integer, and therefore 213 509 009 is not a square number.
The square of a number (here 213 509 009) is the result of the product of this number (213 509 009) by itself (i.e., 213 509 009 × 213 509 009); the square of 213 509 009 is sometimes called "raising 213 509 009 to the power 2", or "213 509 009 squared".
The square of 213 509 009 is 45 586 096 924 162 080 because 213 509 009 × 213 509 009 = 213 509 0092 = 45 586 096 924 162 080.
As a consequence, 213 509 009 is the square root of 45 586 096 924 162 080.
213 509 009 is a number with 9 digits.
The multiples of 213 509 009 are all integers evenly divisible by 213 509 009, that is all numbers such that the remainder of the division by 213 509 009 is zero. There are infinitely many multiples of 213 509 009. The smallest multiples of 213 509 009 are: