It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 900 998 is not a prime number.
For example, 900 998 can be divided by 2: 900 998 / 2 = 450 499.
For 900 998 to be a prime number, it would have been required that 900 998 has only two divisors, i.e., itself and 1.
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900 998 is an even number, because it is evenly divisible by 2: 900 998 / 2 = 450 499.
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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 900 998 is about 949.209.
Thus, the square root of 900 998 is not an integer, and therefore 900 998 is not a square number.
The square of a number (here 900 998) is the result of the product of this number (900 998) by itself (i.e., 900 998 × 900 998); the square of 900 998 is sometimes called "raising 900 998 to the power 2", or "900 998 squared".
The square of 900 998 is 811 797 396 004 because 900 998 × 900 998 = 900 9982 = 811 797 396 004.
As a consequence, 900 998 is the square root of 811 797 396 004.
The multiples of 900 998 are all integers evenly divisible by 900 998, that is all numbers such that the remainder of the division by 900 998 is zero. There are infinitely many multiples of 900 998. The smallest multiples of 900 998 are: