It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 804 is not a prime number.
For example, 138 804 can be divided by 2: 138 804 / 2 = 69 402.
For 138 804 to be a prime number, it would have been required that 138 804 has only two divisors, i.e., itself and 1.
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138 804 is an even number, because it is evenly divisible by 2: 138 804 / 2 = 69 402.
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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 138 804 is about 372.564.
Thus, the square root of 138 804 is not an integer, and therefore 138 804 is not a square number.
The square of a number (here 138 804) is the result of the product of this number (138 804) by itself (i.e., 138 804 × 138 804); the square of 138 804 is sometimes called "raising 138 804 to the power 2", or "138 804 squared".
The square of 138 804 is 19 266 550 416 because 138 804 × 138 804 = 138 8042 = 19 266 550 416.
As a consequence, 138 804 is the square root of 19 266 550 416.
The multiples of 138 804 are all integers evenly divisible by 138 804, that is all numbers such that the remainder of the division by 138 804 is zero. There are infinitely many multiples of 138 804. The smallest multiples of 138 804 are: