It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 988 491 is not a prime number.
For example, 988 491 can be divided by 3: 988 491 / 3 = 329 497.
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For 988 491 to be a prime number, it would have been required that 988 491 has only two divisors, i.e., itself and 1.
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988 491 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 988 491 is about 994.229.
Thus, the square root of 988 491 is not an integer, and therefore 988 491 is not a square number.
The square of a number (here 988 491) is the result of the product of this number (988 491) by itself (i.e., 988 491 × 988 491); the square of 988 491 is sometimes called "raising 988 491 to the power 2", or "988 491 squared".
The square of 988 491 is 977 114 457 081 because 988 491 × 988 491 = 988 4912 = 977 114 457 081.
As a consequence, 988 491 is the square root of 977 114 457 081.
The multiples of 988 491 are all integers evenly divisible by 988 491, that is all numbers such that the remainder of the division by 988 491 is zero. There are infinitely many multiples of 988 491. The smallest multiples of 988 491 are: