It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 997 644 is not a prime number.
For example, 997 644 can be divided by 2: 997 644 / 2 = 498 822.
For 997 644 to be a prime number, it would have been required that 997 644 has only two divisors, i.e., itself and 1.
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997 644 is an even number, because it is evenly divisible by 2: 997 644 / 2 = 498 822.
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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 997 644 is about 998.821.
Thus, the square root of 997 644 is not an integer, and therefore 997 644 is not a square number.
The square of a number (here 997 644) is the result of the product of this number (997 644) by itself (i.e., 997 644 × 997 644); the square of 997 644 is sometimes called "raising 997 644 to the power 2", or "997 644 squared".
The square of 997 644 is 995 293 550 736 because 997 644 × 997 644 = 997 6442 = 995 293 550 736.
As a consequence, 997 644 is the square root of 995 293 550 736.
The multiples of 997 644 are all integers evenly divisible by 997 644, that is all numbers such that the remainder of the division by 997 644 is zero. There are infinitely many multiples of 997 644. The smallest multiples of 997 644 are: