It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 138 is not a prime number.
For example, 998 138 can be divided by 2: 998 138 / 2 = 499 069.
For 998 138 to be a prime number, it would have been required that 998 138 has only two divisors, i.e., itself and 1.
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998 138 is an even number, because it is evenly divisible by 2: 998 138 / 2 = 499 069.
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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 998 138 is about 999.069.
Thus, the square root of 998 138 is not an integer, and therefore 998 138 is not a square number.
The square of a number (here 998 138) is the result of the product of this number (998 138) by itself (i.e., 998 138 × 998 138); the square of 998 138 is sometimes called "raising 998 138 to the power 2", or "998 138 squared".
The square of 998 138 is 996 279 467 044 because 998 138 × 998 138 = 998 1382 = 996 279 467 044.
As a consequence, 998 138 is the square root of 996 279 467 044.
The multiples of 998 138 are all integers evenly divisible by 998 138, that is all numbers such that the remainder of the division by 998 138 is zero. There are infinitely many multiples of 998 138. The smallest multiples of 998 138 are: