Determine wheather 87 is a prime number or composite number ?? .....also with explanation simplify it... ( whoever ans first i will mark as brainliest)
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Answered by
1
Answer:
87
is not a prime number but is a composite number.
Step-by-step explanation:
To check whether a number is a prime number or not, one may take a number less than approximately its square root.
Here a number less than approximately the square root of
87
is
9
, so one needs to try division of
87
by prime numbers up to number
9
.
As prime numbers up to
9
are only
{
2
,
3
,
5
,
7
}
and number is divisible by
3
(one can check by using divisibility rule),
87
is not a prime number but is a composite number.
In fact
87
=
3
×
29
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