It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 987 998 is not a prime number.
For example, 987 998 can be divided by 2: 987 998 / 2 = 493 999.
For 987 998 to be a prime number, it would have been required that 987 998 has only two divisors, i.e., itself and 1.
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987 998 is an even number, because it is evenly divisible by 2: 987 998 / 2 = 493 999.
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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 987 998 is about 993.981.
Thus, the square root of 987 998 is not an integer, and therefore 987 998 is not a square number.
The square of a number (here 987 998) is the result of the product of this number (987 998) by itself (i.e., 987 998 × 987 998); the square of 987 998 is sometimes called "raising 987 998 to the power 2", or "987 998 squared".
The square of 987 998 is 976 140 048 004 because 987 998 × 987 998 = 987 9982 = 976 140 048 004.
As a consequence, 987 998 is the square root of 976 140 048 004.
The multiples of 987 998 are all integers evenly divisible by 987 998, that is all numbers such that the remainder of the division by 987 998 is zero. There are infinitely many multiples of 987 998. The smallest multiples of 987 998 are: