It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 990 678 is not a prime number.
For example, 990 678 can be divided by 2: 990 678 / 2 = 495 339.
For 990 678 to be a prime number, it would have been required that 990 678 has only two divisors, i.e., itself and 1.
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990 678 is an even number, because it is evenly divisible by 2: 990 678 / 2 = 495 339.
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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 990 678 is about 995.328.
Thus, the square root of 990 678 is not an integer, and therefore 990 678 is not a square number.
The square of a number (here 990 678) is the result of the product of this number (990 678) by itself (i.e., 990 678 × 990 678); the square of 990 678 is sometimes called "raising 990 678 to the power 2", or "990 678 squared".
The square of 990 678 is 981 442 899 684 because 990 678 × 990 678 = 990 6782 = 981 442 899 684.
As a consequence, 990 678 is the square root of 981 442 899 684.
The multiples of 990 678 are all integers evenly divisible by 990 678, that is all numbers such that the remainder of the division by 990 678 is zero. There are infinitely many multiples of 990 678. The smallest multiples of 990 678 are: