It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 990 498 is not a prime number.
For example, 990 498 can be divided by 2: 990 498 / 2 = 495 249.
For 990 498 to be a prime number, it would have been required that 990 498 has only two divisors, i.e., itself and 1.
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990 498 is an even number, because it is evenly divisible by 2: 990 498 / 2 = 495 249.
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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 990 498 is about 995.238.
Thus, the square root of 990 498 is not an integer, and therefore 990 498 is not a square number.
The square of a number (here 990 498) is the result of the product of this number (990 498) by itself (i.e., 990 498 × 990 498); the square of 990 498 is sometimes called "raising 990 498 to the power 2", or "990 498 squared".
The square of 990 498 is 981 086 288 004 because 990 498 × 990 498 = 990 4982 = 981 086 288 004.
As a consequence, 990 498 is the square root of 981 086 288 004.
The multiples of 990 498 are all integers evenly divisible by 990 498, that is all numbers such that the remainder of the division by 990 498 is zero. There are infinitely many multiples of 990 498. The smallest multiples of 990 498 are: