It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 842 is not a prime number.
For example, 138 842 can be divided by 2: 138 842 / 2 = 69 421.
For 138 842 to be a prime number, it would have been required that 138 842 has only two divisors, i.e., itself and 1.
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138 842 is an even number, because it is evenly divisible by 2: 138 842 / 2 = 69 421.
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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 138 842 is about 372.615.
Thus, the square root of 138 842 is not an integer, and therefore 138 842 is not a square number.
The square of a number (here 138 842) is the result of the product of this number (138 842) by itself (i.e., 138 842 × 138 842); the square of 138 842 is sometimes called "raising 138 842 to the power 2", or "138 842 squared".
The square of 138 842 is 19 277 100 964 because 138 842 × 138 842 = 138 8422 = 19 277 100 964.
As a consequence, 138 842 is the square root of 19 277 100 964.
The multiples of 138 842 are all integers evenly divisible by 138 842, that is all numbers such that the remainder of the division by 138 842 is zero. There are infinitely many multiples of 138 842. The smallest multiples of 138 842 are: