It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 628 is not a prime number.
For example, 998 628 can be divided by 2: 998 628 / 2 = 499 314.
For 998 628 to be a prime number, it would have been required that 998 628 has only two divisors, i.e., itself and 1.
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998 628 is an even number, because it is evenly divisible by 2: 998 628 / 2 = 499 314.
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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 998 628 is about 999.314.
Thus, the square root of 998 628 is not an integer, and therefore 998 628 is not a square number.
The square of a number (here 998 628) is the result of the product of this number (998 628) by itself (i.e., 998 628 × 998 628); the square of 998 628 is sometimes called "raising 998 628 to the power 2", or "998 628 squared".
The square of 998 628 is 997 257 882 384 because 998 628 × 998 628 = 998 6282 = 997 257 882 384.
As a consequence, 998 628 is the square root of 997 257 882 384.
The multiples of 998 628 are all integers evenly divisible by 998 628, that is all numbers such that the remainder of the division by 998 628 is zero. There are infinitely many multiples of 998 628. The smallest multiples of 998 628 are: