It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 121 673 642 is not a prime number.
For example, 121 673 642 can be divided by 2: 121 673 642 / 2 = 60 836 821.
For 121 673 642 to be a prime number, it would have been required that 121 673 642 has only two divisors, i.e., itself and 1.
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121 673 642 is an even number, because it is evenly divisible by 2: 121 673 642 / 2 = 60 836 821.
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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 121 673 642 is about 11 030.578.
Thus, the square root of 121 673 642 is not an integer, and therefore 121 673 642 is not a square number.
The square of a number (here 121 673 642) is the result of the product of this number (121 673 642) by itself (i.e., 121 673 642 × 121 673 642); the square of 121 673 642 is sometimes called "raising 121 673 642 to the power 2", or "121 673 642 squared".
The square of 121 673 642 is 14 804 475 157 544 164 because 121 673 642 × 121 673 642 = 121 673 6422 = 14 804 475 157 544 164.
As a consequence, 121 673 642 is the square root of 14 804 475 157 544 164.
121 673 642 is a number with 9 digits.
The multiples of 121 673 642 are all integers evenly divisible by 121 673 642, that is all numbers such that the remainder of the division by 121 673 642 is zero. There are infinitely many multiples of 121 673 642. The smallest multiples of 121 673 642 are: