It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 427 is not a prime number.
For example, 998 427 can be divided by 3: 998 427 / 3 = 332 809.
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For 998 427 to be a prime number, it would have been required that 998 427 has only two divisors, i.e., itself and 1.
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998 427 is an odd number, because it is not evenly divisible by 2.
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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 998 427 is about 999.213.
Thus, the square root of 998 427 is not an integer, and therefore 998 427 is not a square number.
The square of a number (here 998 427) is the result of the product of this number (998 427) by itself (i.e., 998 427 × 998 427); the square of 998 427 is sometimes called "raising 998 427 to the power 2", or "998 427 squared".
The square of 998 427 is 996 856 474 329 because 998 427 × 998 427 = 998 4272 = 996 856 474 329.
As a consequence, 998 427 is the square root of 996 856 474 329.
The multiples of 998 427 are all integers evenly divisible by 998 427, that is all numbers such that the remainder of the division by 998 427 is zero. There are infinitely many multiples of 998 427. The smallest multiples of 998 427 are: