It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 988 258 is not a prime number.
For example, 988 258 can be divided by 2: 988 258 / 2 = 494 129.
For 988 258 to be a prime number, it would have been required that 988 258 has only two divisors, i.e., itself and 1.
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988 258 is an even number, because it is evenly divisible by 2: 988 258 / 2 = 494 129.
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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 988 258 is about 994.112.
Thus, the square root of 988 258 is not an integer, and therefore 988 258 is not a square number.
The square of a number (here 988 258) is the result of the product of this number (988 258) by itself (i.e., 988 258 × 988 258); the square of 988 258 is sometimes called "raising 988 258 to the power 2", or "988 258 squared".
The square of 988 258 is 976 653 874 564 because 988 258 × 988 258 = 988 2582 = 976 653 874 564.
As a consequence, 988 258 is the square root of 976 653 874 564.
The multiples of 988 258 are all integers evenly divisible by 988 258, that is all numbers such that the remainder of the division by 988 258 is zero. There are infinitely many multiples of 988 258. The smallest multiples of 988 258 are: