It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 664 is not a prime number.
For example, 998 664 can be divided by 2: 998 664 / 2 = 499 332.
For 998 664 to be a prime number, it would have been required that 998 664 has only two divisors, i.e., itself and 1.
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998 664 is an even number, because it is evenly divisible by 2: 998 664 / 2 = 499 332.
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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 998 664 is about 999.332.
Thus, the square root of 998 664 is not an integer, and therefore 998 664 is not a square number.
The square of a number (here 998 664) is the result of the product of this number (998 664) by itself (i.e., 998 664 × 998 664); the square of 998 664 is sometimes called "raising 998 664 to the power 2", or "998 664 squared".
The square of 998 664 is 997 329 784 896 because 998 664 × 998 664 = 998 6642 = 997 329 784 896.
As a consequence, 998 664 is the square root of 997 329 784 896.
The multiples of 998 664 are all integers evenly divisible by 998 664, that is all numbers such that the remainder of the division by 998 664 is zero. There are infinitely many multiples of 998 664. The smallest multiples of 998 664 are: