It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 501 998 is not a prime number.
For example, 501 998 can be divided by 2: 501 998 / 2 = 250 999.
For 501 998 to be a prime number, it would have been required that 501 998 has only two divisors, i.e., itself and 1.
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501 998 is an even number, because it is evenly divisible by 2: 501 998 / 2 = 250 999.
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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 501 998 is about 708.518.
Thus, the square root of 501 998 is not an integer, and therefore 501 998 is not a square number.
The square of a number (here 501 998) is the result of the product of this number (501 998) by itself (i.e., 501 998 × 501 998); the square of 501 998 is sometimes called "raising 501 998 to the power 2", or "501 998 squared".
The square of 501 998 is 252 001 992 004 because 501 998 × 501 998 = 501 9982 = 252 001 992 004.
As a consequence, 501 998 is the square root of 252 001 992 004.
The multiples of 501 998 are all integers evenly divisible by 501 998, that is all numbers such that the remainder of the division by 501 998 is zero. There are infinitely many multiples of 501 998. The smallest multiples of 501 998 are: