It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 388 138 is not a prime number.
For example, 388 138 can be divided by 2: 388 138 / 2 = 194 069.
For 388 138 to be a prime number, it would have been required that 388 138 has only two divisors, i.e., itself and 1.
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388 138 is an even number, because it is evenly divisible by 2: 388 138 / 2 = 194 069.
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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 388 138 is about 623.007.
Thus, the square root of 388 138 is not an integer, and therefore 388 138 is not a square number.
The square of a number (here 388 138) is the result of the product of this number (388 138) by itself (i.e., 388 138 × 388 138); the square of 388 138 is sometimes called "raising 388 138 to the power 2", or "388 138 squared".
The square of 388 138 is 150 651 107 044 because 388 138 × 388 138 = 388 1382 = 150 651 107 044.
As a consequence, 388 138 is the square root of 150 651 107 044.
The multiples of 388 138 are all integers evenly divisible by 388 138, that is all numbers such that the remainder of the division by 388 138 is zero. There are infinitely many multiples of 388 138. The smallest multiples of 388 138 are: