It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 990 157 998 is not a prime number.
For example, 990 157 998 can be divided by 2: 990 157 998 / 2 = 495 078 999.
For 990 157 998 to be a prime number, it would have been required that 990 157 998 has only two divisors, i.e., itself and 1.
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990 157 998 is an even number, because it is evenly divisible by 2: 990 157 998 / 2 = 495 078 999.
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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 990 157 998 is about 31 466.776.
Thus, the square root of 990 157 998 is not an integer, and therefore 990 157 998 is not a square number.
The square of a number (here 990 157 998) is the result of the product of this number (990 157 998) by itself (i.e., 990 157 998 × 990 157 998); the square of 990 157 998 is sometimes called "raising 990 157 998 to the power 2", or "990 157 998 squared".
The square of 990 157 998 is 980 412 861 003 368 064 because 990 157 998 × 990 157 998 = 990 157 9982 = 980 412 861 003 368 064.
As a consequence, 990 157 998 is the square root of 980 412 861 003 368 064.
990 157 998 is a number with 9 digits.
The multiples of 990 157 998 are all integers evenly divisible by 990 157 998, that is all numbers such that the remainder of the division by 990 157 998 is zero. There are infinitely many multiples of 990 157 998. The smallest multiples of 990 157 998 are: