It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 118 is not a prime number.
For example, 138 118 can be divided by 2: 138 118 / 2 = 69 059.
For 138 118 to be a prime number, it would have been required that 138 118 has only two divisors, i.e., itself and 1.
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138 118 is an even number, because it is evenly divisible by 2: 138 118 / 2 = 69 059.
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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 138 118 is about 371.642.
Thus, the square root of 138 118 is not an integer, and therefore 138 118 is not a square number.
The square of a number (here 138 118) is the result of the product of this number (138 118) by itself (i.e., 138 118 × 138 118); the square of 138 118 is sometimes called "raising 138 118 to the power 2", or "138 118 squared".
The square of 138 118 is 19 076 581 924 because 138 118 × 138 118 = 138 1182 = 19 076 581 924.
As a consequence, 138 118 is the square root of 19 076 581 924.
The multiples of 138 118 are all integers evenly divisible by 138 118, that is all numbers such that the remainder of the division by 138 118 is zero. There are infinitely many multiples of 138 118. The smallest multiples of 138 118 are: