It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 355 242 is not a prime number.
For example, 138 355 242 can be divided by 2: 138 355 242 / 2 = 69 177 621.
For 138 355 242 to be a prime number, it would have been required that 138 355 242 has only two divisors, i.e., itself and 1.
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138 355 242 is an even number, because it is evenly divisible by 2: 138 355 242 / 2 = 69 177 621.
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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 138 355 242 is about 11 762.451.
Thus, the square root of 138 355 242 is not an integer, and therefore 138 355 242 is not a square number.
The square of a number (here 138 355 242) is the result of the product of this number (138 355 242) by itself (i.e., 138 355 242 × 138 355 242); the square of 138 355 242 is sometimes called "raising 138 355 242 to the power 2", or "138 355 242 squared".
The square of 138 355 242 is 19 142 172 988 878 564 because 138 355 242 × 138 355 242 = 138 355 2422 = 19 142 172 988 878 564.
As a consequence, 138 355 242 is the square root of 19 142 172 988 878 564.
138 355 242 is a number with 9 digits.
The multiples of 138 355 242 are all integers evenly divisible by 138 355 242, that is all numbers such that the remainder of the division by 138 355 242 is zero. There are infinitely many multiples of 138 355 242. The smallest multiples of 138 355 242 are: