It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 987 121 is not a prime number.
For example, 987 121 can be divided by 773: 987 121 / 773 = 1 277.
For 987 121 to be a prime number, it would have been required that 987 121 has only two divisors, i.e., itself and 1.
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987 121 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 987 121 is about 993.540.
Thus, the square root of 987 121 is not an integer, and therefore 987 121 is not a square number.
The square of a number (here 987 121) is the result of the product of this number (987 121) by itself (i.e., 987 121 × 987 121); the square of 987 121 is sometimes called "raising 987 121 to the power 2", or "987 121 squared".
The square of 987 121 is 974 407 868 641 because 987 121 × 987 121 = 987 1212 = 974 407 868 641.
As a consequence, 987 121 is the square root of 974 407 868 641.
The multiples of 987 121 are all integers evenly divisible by 987 121, that is all numbers such that the remainder of the division by 987 121 is zero. There are infinitely many multiples of 987 121. The smallest multiples of 987 121 are: