Is 525 a prime or composite number?

1 Answer
Shwetank Mauria
Apr 1, 2016

#525# is a composite number.

Explanation:

While prime numbers do not have any factor other than #1# and the number itself, composite numbers do have factors other than #1# and the number itself. Note here, the number itself means #525#.

As #525# is clearly divisible by #5# (last digit being one of 5 or 0) as also by #3# (as sum of digits is 12 divisible by 3), #525# is divisible both by #3# and #5# as well as #15#.

Hence #525# is a composite number.

In fact #525# has its factor as #{1,3,5,7,15,21,25,35,75,105,175,525}#

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