It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 088 is not a prime number.
For example, 138 088 can be divided by 2: 138 088 / 2 = 69 044.
For 138 088 to be a prime number, it would have been required that 138 088 has only two divisors, i.e., itself and 1.
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138 088 is an even number, because it is evenly divisible by 2: 138 088 / 2 = 69 044.
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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 138 088 is about 371.602.
Thus, the square root of 138 088 is not an integer, and therefore 138 088 is not a square number.
The square of a number (here 138 088) is the result of the product of this number (138 088) by itself (i.e., 138 088 × 138 088); the square of 138 088 is sometimes called "raising 138 088 to the power 2", or "138 088 squared".
The square of 138 088 is 19 068 295 744 because 138 088 × 138 088 = 138 0882 = 19 068 295 744.
As a consequence, 138 088 is the square root of 19 068 295 744.
The multiples of 138 088 are all integers evenly divisible by 138 088, that is all numbers such that the remainder of the division by 138 088 is zero. There are infinitely many multiples of 138 088. The smallest multiples of 138 088 are: