It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 298 is not a prime number.
For example, 138 298 can be divided by 2: 138 298 / 2 = 69 149.
For 138 298 to be a prime number, it would have been required that 138 298 has only two divisors, i.e., itself and 1.
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138 298 is an even number, because it is evenly divisible by 2: 138 298 / 2 = 69 149.
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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 138 298 is about 371.884.
Thus, the square root of 138 298 is not an integer, and therefore 138 298 is not a square number.
The square of a number (here 138 298) is the result of the product of this number (138 298) by itself (i.e., 138 298 × 138 298); the square of 138 298 is sometimes called "raising 138 298 to the power 2", or "138 298 squared".
The square of 138 298 is 19 126 336 804 because 138 298 × 138 298 = 138 2982 = 19 126 336 804.
As a consequence, 138 298 is the square root of 19 126 336 804.
The multiples of 138 298 are all integers evenly divisible by 138 298, that is all numbers such that the remainder of the division by 138 298 is zero. There are infinitely many multiples of 138 298. The smallest multiples of 138 298 are: