It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 997 667 is not a prime number.
For example, 997 667 can be divided by 11: 997 667 / 11 = 90 697.
For 997 667 to be a prime number, it would have been required that 997 667 has only two divisors, i.e., itself and 1.
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997 667 is an odd number, because it is not evenly divisible by 2.
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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 997 667 is about 998.833.
Thus, the square root of 997 667 is not an integer, and therefore 997 667 is not a square number.
The square of a number (here 997 667) is the result of the product of this number (997 667) by itself (i.e., 997 667 × 997 667); the square of 997 667 is sometimes called "raising 997 667 to the power 2", or "997 667 squared".
The square of 997 667 is 995 339 442 889 because 997 667 × 997 667 = 997 6672 = 995 339 442 889.
As a consequence, 997 667 is the square root of 995 339 442 889.
The multiples of 997 667 are all integers evenly divisible by 997 667, that is all numbers such that the remainder of the division by 997 667 is zero. There are infinitely many multiples of 997 667. The smallest multiples of 997 667 are: