It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 564 is not a prime number.
For example, 998 564 can be divided by 2: 998 564 / 2 = 499 282.
For 998 564 to be a prime number, it would have been required that 998 564 has only two divisors, i.e., itself and 1.
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998 564 is an even number, because it is evenly divisible by 2: 998 564 / 2 = 499 282.
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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 998 564 is about 999.282.
Thus, the square root of 998 564 is not an integer, and therefore 998 564 is not a square number.
The square of a number (here 998 564) is the result of the product of this number (998 564) by itself (i.e., 998 564 × 998 564); the square of 998 564 is sometimes called "raising 998 564 to the power 2", or "998 564 squared".
The square of 998 564 is 997 130 062 096 because 998 564 × 998 564 = 998 5642 = 997 130 062 096.
As a consequence, 998 564 is the square root of 997 130 062 096.
The multiples of 998 564 are all integers evenly divisible by 998 564, that is all numbers such that the remainder of the division by 998 564 is zero. There are infinitely many multiples of 998 564. The smallest multiples of 998 564 are: