It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 990 378 is not a prime number.
For example, 990 378 can be divided by 2: 990 378 / 2 = 495 189.
For 990 378 to be a prime number, it would have been required that 990 378 has only two divisors, i.e., itself and 1.
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990 378 is an even number, because it is evenly divisible by 2: 990 378 / 2 = 495 189.
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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 990 378 is about 995.177.
Thus, the square root of 990 378 is not an integer, and therefore 990 378 is not a square number.
The square of a number (here 990 378) is the result of the product of this number (990 378) by itself (i.e., 990 378 × 990 378); the square of 990 378 is sometimes called "raising 990 378 to the power 2", or "990 378 squared".
The square of 990 378 is 980 848 582 884 because 990 378 × 990 378 = 990 3782 = 980 848 582 884.
As a consequence, 990 378 is the square root of 980 848 582 884.
The multiples of 990 378 are all integers evenly divisible by 990 378, that is all numbers such that the remainder of the division by 990 378 is zero. There are infinitely many multiples of 990 378. The smallest multiples of 990 378 are: