It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 121 401 is not a prime number.
For example, 121 401 can be divided by 3: 121 401 / 3 = 40 467.
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For 121 401 to be a prime number, it would have been required that 121 401 has only two divisors, i.e., itself and 1.
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121 401 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 121 401 is about 348.426.
Thus, the square root of 121 401 is not an integer, and therefore 121 401 is not a square number.
The square of a number (here 121 401) is the result of the product of this number (121 401) by itself (i.e., 121 401 × 121 401); the square of 121 401 is sometimes called "raising 121 401 to the power 2", or "121 401 squared".
The square of 121 401 is 14 738 202 801 because 121 401 × 121 401 = 121 4012 = 14 738 202 801.
As a consequence, 121 401 is the square root of 14 738 202 801.
The multiples of 121 401 are all integers evenly divisible by 121 401, that is all numbers such that the remainder of the division by 121 401 is zero. There are infinitely many multiples of 121 401. The smallest multiples of 121 401 are: