It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 642 is not a prime number.
For example, 998 642 can be divided by 2: 998 642 / 2 = 499 321.
For 998 642 to be a prime number, it would have been required that 998 642 has only two divisors, i.e., itself and 1.
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998 642 is an even number, because it is evenly divisible by 2: 998 642 / 2 = 499 321.
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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 998 642 is about 999.321.
Thus, the square root of 998 642 is not an integer, and therefore 998 642 is not a square number.
The square of a number (here 998 642) is the result of the product of this number (998 642) by itself (i.e., 998 642 × 998 642); the square of 998 642 is sometimes called "raising 998 642 to the power 2", or "998 642 squared".
The square of 998 642 is 997 285 844 164 because 998 642 × 998 642 = 998 6422 = 997 285 844 164.
As a consequence, 998 642 is the square root of 997 285 844 164.
The multiples of 998 642 are all integers evenly divisible by 998 642, that is all numbers such that the remainder of the division by 998 642 is zero. There are infinitely many multiples of 998 642. The smallest multiples of 998 642 are: