It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 997 664 is not a prime number.
For example, 997 664 can be divided by 2: 997 664 / 2 = 498 832.
For 997 664 to be a prime number, it would have been required that 997 664 has only two divisors, i.e., itself and 1.
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997 664 is an even number, because it is evenly divisible by 2: 997 664 / 2 = 498 832.
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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 997 664 is about 998.831.
Thus, the square root of 997 664 is not an integer, and therefore 997 664 is not a square number.
The square of a number (here 997 664) is the result of the product of this number (997 664) by itself (i.e., 997 664 × 997 664); the square of 997 664 is sometimes called "raising 997 664 to the power 2", or "997 664 squared".
The square of 997 664 is 995 333 456 896 because 997 664 × 997 664 = 997 6642 = 995 333 456 896.
As a consequence, 997 664 is the square root of 995 333 456 896.
The multiples of 997 664 are all integers evenly divisible by 997 664, that is all numbers such that the remainder of the division by 997 664 is zero. There are infinitely many multiples of 997 664. The smallest multiples of 997 664 are: