It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 298 138 is not a prime number.
For example, 298 138 can be divided by 2: 298 138 / 2 = 149 069.
For 298 138 to be a prime number, it would have been required that 298 138 has only two divisors, i.e., itself and 1.
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298 138 is an even number, because it is evenly divisible by 2: 298 138 / 2 = 149 069.
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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 298 138 is about 546.020.
Thus, the square root of 298 138 is not an integer, and therefore 298 138 is not a square number.
The square of a number (here 298 138) is the result of the product of this number (298 138) by itself (i.e., 298 138 × 298 138); the square of 298 138 is sometimes called "raising 298 138 to the power 2", or "298 138 squared".
The square of 298 138 is 88 886 267 044 because 298 138 × 298 138 = 298 1382 = 88 886 267 044.
As a consequence, 298 138 is the square root of 88 886 267 044.
The multiples of 298 138 are all integers evenly divisible by 298 138, that is all numbers such that the remainder of the division by 298 138 is zero. There are infinitely many multiples of 298 138. The smallest multiples of 298 138 are: