It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 709 789 is not a prime number.
For example, 138 709 789 can be divided by 71: 138 709 789 / 71 = 1 953 659.
For 138 709 789 to be a prime number, it would have been required that 138 709 789 has only two divisors, i.e., itself and 1.
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138 709 789 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 138 709 789 is about 11 777.512.
Thus, the square root of 138 709 789 is not an integer, and therefore 138 709 789 is not a square number.
The square of a number (here 138 709 789) is the result of the product of this number (138 709 789) by itself (i.e., 138 709 789 × 138 709 789); the square of 138 709 789 is sometimes called "raising 138 709 789 to the power 2", or "138 709 789 squared".
The square of 138 709 789 is 19 240 405 564 424 520 because 138 709 789 × 138 709 789 = 138 709 7892 = 19 240 405 564 424 520.
As a consequence, 138 709 789 is the square root of 19 240 405 564 424 520.
138 709 789 is a number with 9 digits.
The multiples of 138 709 789 are all integers evenly divisible by 138 709 789, that is all numbers such that the remainder of the division by 138 709 789 is zero. There are infinitely many multiples of 138 709 789. The smallest multiples of 138 709 789 are: