It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 991 009 is not a prime number.
For example, 138 991 009 can be divided by 97: 138 991 009 / 97 = 1 432 897.
For 138 991 009 to be a prime number, it would have been required that 138 991 009 has only two divisors, i.e., itself and 1.
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138 991 009 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 138 991 009 is about 11 789.445.
Thus, the square root of 138 991 009 is not an integer, and therefore 138 991 009 is not a square number.
The square of a number (here 138 991 009) is the result of the product of this number (138 991 009) by itself (i.e., 138 991 009 × 138 991 009); the square of 138 991 009 is sometimes called "raising 138 991 009 to the power 2", or "138 991 009 squared".
The square of 138 991 009 is 19 318 500 582 838 080 because 138 991 009 × 138 991 009 = 138 991 0092 = 19 318 500 582 838 080.
As a consequence, 138 991 009 is the square root of 19 318 500 582 838 080.
138 991 009 is a number with 9 digits.
The multiples of 138 991 009 are all integers evenly divisible by 138 991 009, that is all numbers such that the remainder of the division by 138 991 009 is zero. There are infinitely many multiples of 138 991 009. The smallest multiples of 138 991 009 are: