It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 987 242 is not a prime number.
For example, 987 242 can be divided by 2: 987 242 / 2 = 493 621.
For 987 242 to be a prime number, it would have been required that 987 242 has only two divisors, i.e., itself and 1.
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987 242 is an even number, because it is evenly divisible by 2: 987 242 / 2 = 493 621.
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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 987 242 is about 993.601.
Thus, the square root of 987 242 is not an integer, and therefore 987 242 is not a square number.
The square of a number (here 987 242) is the result of the product of this number (987 242) by itself (i.e., 987 242 × 987 242); the square of 987 242 is sometimes called "raising 987 242 to the power 2", or "987 242 squared".
The square of 987 242 is 974 646 766 564 because 987 242 × 987 242 = 987 2422 = 974 646 766 564.
As a consequence, 987 242 is the square root of 974 646 766 564.
The multiples of 987 242 are all integers evenly divisible by 987 242, that is all numbers such that the remainder of the division by 987 242 is zero. There are infinitely many multiples of 987 242. The smallest multiples of 987 242 are: