It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 121 988 is not a prime number.
For example, 121 988 can be divided by 2: 121 988 / 2 = 60 994.
For 121 988 to be a prime number, it would have been required that 121 988 has only two divisors, i.e., itself and 1.
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121 988 is an even number, because it is evenly divisible by 2: 121 988 / 2 = 60 994.
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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 121 988 is about 349.268.
Thus, the square root of 121 988 is not an integer, and therefore 121 988 is not a square number.
The square of a number (here 121 988) is the result of the product of this number (121 988) by itself (i.e., 121 988 × 121 988); the square of 121 988 is sometimes called "raising 121 988 to the power 2", or "121 988 squared".
The square of 121 988 is 14 881 072 144 because 121 988 × 121 988 = 121 9882 = 14 881 072 144.
As a consequence, 121 988 is the square root of 14 881 072 144.
The multiples of 121 988 are all integers evenly divisible by 121 988, that is all numbers such that the remainder of the division by 121 988 is zero. There are infinitely many multiples of 121 988. The smallest multiples of 121 988 are: