It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 121 563 is not a prime number.
For example, 121 563 can be divided by 3: 121 563 / 3 = 40 521.
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For 121 563 to be a prime number, it would have been required that 121 563 has only two divisors, i.e., itself and 1.
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121 563 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 121 563 is about 348.659.
Thus, the square root of 121 563 is not an integer, and therefore 121 563 is not a square number.
The square of a number (here 121 563) is the result of the product of this number (121 563) by itself (i.e., 121 563 × 121 563); the square of 121 563 is sometimes called "raising 121 563 to the power 2", or "121 563 squared".
The square of 121 563 is 14 777 562 969 because 121 563 × 121 563 = 121 5632 = 14 777 562 969.
As a consequence, 121 563 is the square root of 14 777 562 969.
The multiples of 121 563 are all integers evenly divisible by 121 563, that is all numbers such that the remainder of the division by 121 563 is zero. There are infinitely many multiples of 121 563. The smallest multiples of 121 563 are: