It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 104 is not a prime number.
For example, 138 104 can be divided by 2: 138 104 / 2 = 69 052.
For 138 104 to be a prime number, it would have been required that 138 104 has only two divisors, i.e., itself and 1.
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138 104 is an even number, because it is evenly divisible by 2: 138 104 / 2 = 69 052.
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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 138 104 is about 371.623.
Thus, the square root of 138 104 is not an integer, and therefore 138 104 is not a square number.
The square of a number (here 138 104) is the result of the product of this number (138 104) by itself (i.e., 138 104 × 138 104); the square of 138 104 is sometimes called "raising 138 104 to the power 2", or "138 104 squared".
The square of 138 104 is 19 072 714 816 because 138 104 × 138 104 = 138 1042 = 19 072 714 816.
As a consequence, 138 104 is the square root of 19 072 714 816.
The multiples of 138 104 are all integers evenly divisible by 138 104, that is all numbers such that the remainder of the division by 138 104 is zero. There are infinitely many multiples of 138 104. The smallest multiples of 138 104 are: