It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 121 427 is not a prime number.
For example, 121 427 can be divided by 31: 121 427 / 31 = 3 917.
For 121 427 to be a prime number, it would have been required that 121 427 has only two divisors, i.e., itself and 1.
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121 427 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 121 427 is about 348.464.
Thus, the square root of 121 427 is not an integer, and therefore 121 427 is not a square number.
The square of a number (here 121 427) is the result of the product of this number (121 427) by itself (i.e., 121 427 × 121 427); the square of 121 427 is sometimes called "raising 121 427 to the power 2", or "121 427 squared".
The square of 121 427 is 14 744 516 329 because 121 427 × 121 427 = 121 4272 = 14 744 516 329.
As a consequence, 121 427 is the square root of 14 744 516 329.
The multiples of 121 427 are all integers evenly divisible by 121 427, that is all numbers such that the remainder of the division by 121 427 is zero. There are infinitely many multiples of 121 427. The smallest multiples of 121 427 are: