It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 748 is not a prime number.
For example, 138 748 can be divided by 2: 138 748 / 2 = 69 374.
For 138 748 to be a prime number, it would have been required that 138 748 has only two divisors, i.e., itself and 1.
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138 748 is an even number, because it is evenly divisible by 2: 138 748 / 2 = 69 374.
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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 138 748 is about 372.489.
Thus, the square root of 138 748 is not an integer, and therefore 138 748 is not a square number.
The square of a number (here 138 748) is the result of the product of this number (138 748) by itself (i.e., 138 748 × 138 748); the square of 138 748 is sometimes called "raising 138 748 to the power 2", or "138 748 squared".
The square of 138 748 is 19 251 007 504 because 138 748 × 138 748 = 138 7482 = 19 251 007 504.
As a consequence, 138 748 is the square root of 19 251 007 504.
The multiples of 138 748 are all integers evenly divisible by 138 748, that is all numbers such that the remainder of the division by 138 748 is zero. There are infinitely many multiples of 138 748. The smallest multiples of 138 748 are: