It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 042 is not a prime number.
For example, 138 042 can be divided by 2: 138 042 / 2 = 69 021.
For 138 042 to be a prime number, it would have been required that 138 042 has only two divisors, i.e., itself and 1.
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138 042 is an even number, because it is evenly divisible by 2: 138 042 / 2 = 69 021.
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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 138 042 is about 371.540.
Thus, the square root of 138 042 is not an integer, and therefore 138 042 is not a square number.
The square of a number (here 138 042) is the result of the product of this number (138 042) by itself (i.e., 138 042 × 138 042); the square of 138 042 is sometimes called "raising 138 042 to the power 2", or "138 042 squared".
The square of 138 042 is 19 055 593 764 because 138 042 × 138 042 = 138 0422 = 19 055 593 764.
As a consequence, 138 042 is the square root of 19 055 593 764.
The multiples of 138 042 are all integers evenly divisible by 138 042, that is all numbers such that the remainder of the division by 138 042 is zero. There are infinitely many multiples of 138 042. The smallest multiples of 138 042 are: