It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 988 138 is not a prime number.
For example, 988 138 can be divided by 2: 988 138 / 2 = 494 069.
For 988 138 to be a prime number, it would have been required that 988 138 has only two divisors, i.e., itself and 1.
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988 138 is an even number, because it is evenly divisible by 2: 988 138 / 2 = 494 069.
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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 988 138 is about 994.051.
Thus, the square root of 988 138 is not an integer, and therefore 988 138 is not a square number.
The square of a number (here 988 138) is the result of the product of this number (988 138) by itself (i.e., 988 138 × 988 138); the square of 988 138 is sometimes called "raising 988 138 to the power 2", or "988 138 squared".
The square of 988 138 is 976 416 707 044 because 988 138 × 988 138 = 988 1382 = 976 416 707 044.
As a consequence, 988 138 is the square root of 976 416 707 044.
The multiples of 988 138 are all integers evenly divisible by 988 138, that is all numbers such that the remainder of the division by 988 138 is zero. There are infinitely many multiples of 988 138. The smallest multiples of 988 138 are: