It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 988 996 021 is not a prime number.
For example, 988 996 021 can be divided by 13: 988 996 021 / 13 = 76 076 617.
For 988 996 021 to be a prime number, it would have been required that 988 996 021 has only two divisors, i.e., itself and 1.
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988 996 021 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 988 996 021 is about 31 448.307.
Thus, the square root of 988 996 021 is not an integer, and therefore 988 996 021 is not a square number.
The square of a number (here 988 996 021) is the result of the product of this number (988 996 021) by itself (i.e., 988 996 021 × 988 996 021); the square of 988 996 021 is sometimes called "raising 988 996 021 to the power 2", or "988 996 021 squared".
The square of 988 996 021 is 978 113 129 553 832 448 because 988 996 021 × 988 996 021 = 988 996 0212 = 978 113 129 553 832 448.
As a consequence, 988 996 021 is the square root of 978 113 129 553 832 448.
988 996 021 is a number with 9 digits.
The multiples of 988 996 021 are all integers evenly divisible by 988 996 021, that is all numbers such that the remainder of the division by 988 996 021 is zero. There are infinitely many multiples of 988 996 021. The smallest multiples of 988 996 021 are: