It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 696 is not a prime number.
For example, 138 696 can be divided by 2: 138 696 / 2 = 69 348.
For 138 696 to be a prime number, it would have been required that 138 696 has only two divisors, i.e., itself and 1.
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138 696 is an even number, because it is evenly divisible by 2: 138 696 / 2 = 69 348.
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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 138 696 is about 372.419.
Thus, the square root of 138 696 is not an integer, and therefore 138 696 is not a square number.
The square of a number (here 138 696) is the result of the product of this number (138 696) by itself (i.e., 138 696 × 138 696); the square of 138 696 is sometimes called "raising 138 696 to the power 2", or "138 696 squared".
The square of 138 696 is 19 236 580 416 because 138 696 × 138 696 = 138 6962 = 19 236 580 416.
As a consequence, 138 696 is the square root of 19 236 580 416.
The multiples of 138 696 are all integers evenly divisible by 138 696, that is all numbers such that the remainder of the division by 138 696 is zero. There are infinitely many multiples of 138 696. The smallest multiples of 138 696 are: