It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 988 is not a prime number.
For example, 138 988 can be divided by 2: 138 988 / 2 = 69 494.
For 138 988 to be a prime number, it would have been required that 138 988 has only two divisors, i.e., itself and 1.
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138 988 is an even number, because it is evenly divisible by 2: 138 988 / 2 = 69 494.
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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 138 988 is about 372.811.
Thus, the square root of 138 988 is not an integer, and therefore 138 988 is not a square number.
The square of a number (here 138 988) is the result of the product of this number (138 988) by itself (i.e., 138 988 × 138 988); the square of 138 988 is sometimes called "raising 138 988 to the power 2", or "138 988 squared".
The square of 138 988 is 19 317 664 144 because 138 988 × 138 988 = 138 9882 = 19 317 664 144.
As a consequence, 138 988 is the square root of 19 317 664 144.
The multiples of 138 988 are all integers evenly divisible by 138 988, that is all numbers such that the remainder of the division by 138 988 is zero. There are infinitely many multiples of 138 988. The smallest multiples of 138 988 are: