It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 115 138 is not a prime number.
For example, 115 138 can be divided by 2: 115 138 / 2 = 57 569.
For 115 138 to be a prime number, it would have been required that 115 138 has only two divisors, i.e., itself and 1.
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115 138 is an even number, because it is evenly divisible by 2: 115 138 / 2 = 57 569.
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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 115 138 is about 339.320.
Thus, the square root of 115 138 is not an integer, and therefore 115 138 is not a square number.
The square of a number (here 115 138) is the result of the product of this number (115 138) by itself (i.e., 115 138 × 115 138); the square of 115 138 is sometimes called "raising 115 138 to the power 2", or "115 138 squared".
The square of 115 138 is 13 256 759 044 because 115 138 × 115 138 = 115 1382 = 13 256 759 044.
As a consequence, 115 138 is the square root of 13 256 759 044.
The multiples of 115 138 are all integers evenly divisible by 115 138, that is all numbers such that the remainder of the division by 115 138 is zero. There are infinitely many multiples of 115 138. The smallest multiples of 115 138 are: