It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 990 684 is not a prime number.
For example, 990 684 can be divided by 2: 990 684 / 2 = 495 342.
For 990 684 to be a prime number, it would have been required that 990 684 has only two divisors, i.e., itself and 1.
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990 684 is an even number, because it is evenly divisible by 2: 990 684 / 2 = 495 342.
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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 990 684 is about 995.331.
Thus, the square root of 990 684 is not an integer, and therefore 990 684 is not a square number.
The square of a number (here 990 684) is the result of the product of this number (990 684) by itself (i.e., 990 684 × 990 684); the square of 990 684 is sometimes called "raising 990 684 to the power 2", or "990 684 squared".
The square of 990 684 is 981 454 787 856 because 990 684 × 990 684 = 990 6842 = 981 454 787 856.
As a consequence, 990 684 is the square root of 981 454 787 856.
The multiples of 990 684 are all integers evenly divisible by 990 684, that is all numbers such that the remainder of the division by 990 684 is zero. There are infinitely many multiples of 990 684. The smallest multiples of 990 684 are: