It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 987 564 is not a prime number.
For example, 987 564 can be divided by 2: 987 564 / 2 = 493 782.
For 987 564 to be a prime number, it would have been required that 987 564 has only two divisors, i.e., itself and 1.
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987 564 is an even number, because it is evenly divisible by 2: 987 564 / 2 = 493 782.
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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 987 564 is about 993.763.
Thus, the square root of 987 564 is not an integer, and therefore 987 564 is not a square number.
The square of a number (here 987 564) is the result of the product of this number (987 564) by itself (i.e., 987 564 × 987 564); the square of 987 564 is sometimes called "raising 987 564 to the power 2", or "987 564 squared".
The square of 987 564 is 975 282 654 096 because 987 564 × 987 564 = 987 5642 = 975 282 654 096.
As a consequence, 987 564 is the square root of 975 282 654 096.
The multiples of 987 564 are all integers evenly divisible by 987 564, that is all numbers such that the remainder of the division by 987 564 is zero. There are infinitely many multiples of 987 564. The smallest multiples of 987 564 are: