It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 161 121 is not a prime number.
For example, 161 121 can be divided by 3: 161 121 / 3 = 53 707.
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For 161 121 to be a prime number, it would have been required that 161 121 has only two divisors, i.e., itself and 1.
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161 121 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 161 121 is about 401.399.
Thus, the square root of 161 121 is not an integer, and therefore 161 121 is not a square number.
The square of a number (here 161 121) is the result of the product of this number (161 121) by itself (i.e., 161 121 × 161 121); the square of 161 121 is sometimes called "raising 161 121 to the power 2", or "161 121 squared".
The square of 161 121 is 25 959 976 641 because 161 121 × 161 121 = 161 1212 = 25 959 976 641.
As a consequence, 161 121 is the square root of 25 959 976 641.
The multiples of 161 121 are all integers evenly divisible by 161 121, that is all numbers such that the remainder of the division by 161 121 is zero. There are infinitely many multiples of 161 121. The smallest multiples of 161 121 are: