It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 475 309 is not a prime number.
For example, 138 475 309 can be divided by 7: 138 475 309 / 7 = 19 782 187.
For 138 475 309 to be a prime number, it would have been required that 138 475 309 has only two divisors, i.e., itself and 1.
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138 475 309 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 138 475 309 is about 11 767.553.
Thus, the square root of 138 475 309 is not an integer, and therefore 138 475 309 is not a square number.
The square of a number (here 138 475 309) is the result of the product of this number (138 475 309) by itself (i.e., 138 475 309 × 138 475 309); the square of 138 475 309 is sometimes called "raising 138 475 309 to the power 2", or "138 475 309 squared".
The square of 138 475 309 is 19 175 411 202 645 480 because 138 475 309 × 138 475 309 = 138 475 3092 = 19 175 411 202 645 480.
As a consequence, 138 475 309 is the square root of 19 175 411 202 645 480.
138 475 309 is a number with 9 digits.
The multiples of 138 475 309 are all integers evenly divisible by 138 475 309, that is all numbers such that the remainder of the division by 138 475 309 is zero. There are infinitely many multiples of 138 475 309. The smallest multiples of 138 475 309 are: